| **Fair Value Measurements (Details) (USD $)In Thousands, unless otherwise specified**                                                                                                            | 12 Months Ended           |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Auction rate securities                                                                                                                                                                          | $ 3,240                   | $ 3,332 |   |
| Duration of securities subject to temporary impairment, minimum (in months)                                                                                                                      | 12 months                 |   |   |
| Decrease in temporary impairment of auction rate securities                                                                                                                                      | 8                         |   |   |
| Amount of temporary impairment                                                                                                                                                                   | 260                       | 268 |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]**                                                                                         |                      |   |   |
| Gross Unrealized Holding, Losses                                                                                                                                                                 | (260)                     | (268) |   |
| **Continuous unrealized loss position, Fair Value [Abstract]**                                                                                                                                   |                      |   |   |
| Total, Fair Value                                                                                                                                                                                | 3,240                     | 3,332 |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                                                                                                            |                      |   |   |
| Total, Unrealized Losses                                                                                                                                                                         | (260)                     | (268) |   |
| Weighted average duration of unrealized losses                                                                                                                                                   | 58 months                 | 46 months |   |
| **Total realized/unrealized gains (losses)**                                                                                                                                                     |                      |   |   |
| Total amount of unrealized gains (losses) for the period included in other comprehensive loss attributable to the change in fair market value of related assets still held at the reporting date | 8                         | 24 | 15 |
| U.S. Government Subsidized Securities [Member]                                                                                                                                                   |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Maturity period of US government subsidized securities (in years)                                                                                                                                | 10 years                  |   |   |
| U.S. Government Subsidized Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]                                                                                              |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Auction rate securities                                                                                                                                                                          | 2,300                     |   |   |
| Investment Company Perpetual Preferred Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]                                                                                       |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Auction rate securities                                                                                                                                                                          | 940                       |   |   |
| Recurring [Member]                                                                                                                                                                               |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Money market funds                                                                                                                                                                               | 56,224                    | 64,068 |   |
| Auction rate securities                                                                                                                                                                          | 3,240                     | 0 |   |
| Investment, total                                                                                                                                                                                | 59,464                    | 64,068 |   |
| Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]                                                                                                     |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Money market funds                                                                                                                                                                               | 56,224                    | 64,068 |   |
| Auction rate securities                                                                                                                                                                          | 0                         | 3,332 |   |
| Investment, total                                                                                                                                                                                | 56,224                    | 67,400 |   |
| Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]                                                                                                                      |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Money market funds                                                                                                                                                                               | 0                         | 0 |   |
| Auction rate securities                                                                                                                                                                          | 0                         | 0 |   |
| Investment, total                                                                                                                                                                                | 0                         | 0 |   |
| Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]                                                                                                                          |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Money market funds                                                                                                                                                                               | 0                         | 0 |   |
| Auction rate securities                                                                                                                                                                          | 3,240                     | 3,332 |   |
| Investment, total                                                                                                                                                                                | 3,240                     | 3,332 |   |
| Minimum [Member]                                                                                                                                                                                 |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Redemption period of auction rate securities (in years)                                                                                                                                          | 4 years                   |   |   |
| Discount rate for valuing auction rate securities (in hundredths)                                                                                                                                | 0.125%                    |   |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                                                                                                            |                      |   |   |
| Severity of the unrealized losses below amortized cost (in hundredths)                                                                                                                           | 6.00%                     | 6.00% |   |
| Maximum [Member]                                                                                                                                                                                 |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Redemption period of auction rate securities (in years)                                                                                                                                          | 15 years                  |   |   |
| Discount rate for valuing auction rate securities (in hundredths)                                                                                                                                | 2.102%                    |   |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                                                                                                            |                      |   |   |
| Severity of the unrealized losses below amortized cost (in hundredths)                                                                                                                           | 8.00%                     | 8.00% |   |
| Weighted average [Member]                                                                                                                                                                        |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Redemption period of auction rate securities (in years)                                                                                                                                          | 5 years 10 months 24 days |   |   |
| Discount rate for valuing auction rate securities (in hundredths)                                                                                                                                | 0.71%                     |   |   |
| Auction Rate Securities [Member]                                                                                                                                                                 |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Amount of temporary impairment                                                                                                                                                                   | 260                       | 268 |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]**                                                                                         |                      |   |   |
| Amortized Cost Basis                                                                                                                                                                             | 3,500                     | 3,600 |   |
| Fair Value                                                                                                                                                                                       | 3,240                     | 3,332 |   |
| Gross Unrealized Holding, Gains                                                                                                                                                                  | 0                         | 0 |   |
| Gross Unrealized Holding, Losses                                                                                                                                                                 | (260)                     | (268) |   |
| Gross Unrealized Holding Gains (Losses), Net                                                                                                                                                     | (260)                     | (268) |   |
| **Continuous unrealized loss position, Fair Value [Abstract]**                                                                                                                                   |                      |   |   |
| Less than 12 Months, Fair Value                                                                                                                                                                  | 0                         | 0 |   |
| 12 Months or Greater, Fair Value                                                                                                                                                                 | 3,240                     | 3,332 |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                                                                                                            |                      |   |   |
| Less than 12 Months, Unrealized Losses                                                                                                                                                           | 0                         | 0 |   |
| 12 Months or Greater, Unrealized Losses                                                                                                                                                          | (260)                     | (268) |   |
| **Summary of activities in financial instruments with significant Level 3 inputs [Roll Forward]**                                                                                                |                      |   |   |
| Balance at beginning of period                                                                                                                                                                   | 3,332                     | 3,608 |   |
| Transfers into Level 3                                                                                                                                                                           | 0                         | 0 |   |
| **Total realized/unrealized gains (losses)**                                                                                                                                                     |                      |   |   |
| Included in net income (loss)                                                                                                                                                                    | 0                         | 0 |   |
| Included in comprehensive income (loss)                                                                                                                                                          | 8                         | 24 |   |
| Settlements                                                                                                                                                                                      | (100)                     | (300) |   |
| Balance at end of period                                                                                                                                                                         | 3,240                     | 3,332 |   |
| Total amount of unrealized gains (losses) for the period included in other comprehensive loss attributable to the change in fair market value of related assets still held at the reporting date | 0                         | 0 |   |
| Auction Rate Securities [Member] | Maturities Greater Than Ten Years [Member]                                                                                                                    |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Amount of temporary impairment                                                                                                                                                                   | 200                       | 208 |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]**                                                                                         |                      |   |   |
| Amortized Cost Basis                                                                                                                                                                             | 2,500                     | 2,600 |   |
| Fair Value                                                                                                                                                                                       | 2,300                     | 2,392 |   |
| Gross Unrealized Holding, Gains                                                                                                                                                                  | 0                         | 0 |   |
| Gross Unrealized Holding, Losses                                                                                                                                                                 | (200)                     | (208) |   |
| Gross Unrealized Holding Gains (Losses), Net                                                                                                                                                     | (200)                     | (208) |   |
| Auction Rate Securities [Member] | Investments Without Stated Maturity Dates [Member]                                                                                                            |                      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                                                                 |                      |   |   |
| Amount of temporary impairment                                                                                                                                                                   | 60                        | 60 |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]**                                                                                         |                      |   |   |
| Amortized Cost Basis                                                                                                                                                                             | 1,000                     | 1,000 |   |
| Fair Value                                                                                                                                                                                       | 940                       | 940 |   |
| Gross Unrealized Holding, Gains                                                                                                                                                                  | 0                         | 0 |   |
| Gross Unrealized Holding, Losses                                                                                                                                                                 | (60)                      | (60) |   |
| Gross Unrealized Holding Gains (Losses), Net                                                                                                                                                     | $ (60)                    | $ (60) |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross percentage of severity of unrealized losses for securities, below amortized costs at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This amount represents the increase in temporary impairment on the investments held by the entity. This could be due to decrease in value of investments.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                         |
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| - Definition
Represents period of maturity of the securities held by the entity which are subject to temporary impairment upon valuation.
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No definition available.
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| - Definition
Represents maturity period of securities held by the entity as on date of reporting.
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No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Refers to period of weighted average duration of the unrealized losses.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for securities categorized neither as held-to-maturity nor trading securities.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
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| - Definition
The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
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| - Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
No definition available.
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| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.
+ References
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| - Definition
Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| - Definition
Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value.  For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.
+ References
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| - Definition
Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).
+ References
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| - Definition
Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).
+ References
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| - Definition
Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.
+ References
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| - Definition
Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.
+ References
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| - Definition
This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.
+ References
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| - Definition
Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.
+ References
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