| **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]**         |            |      |     |   |
| Contingent consideration liability                                                                       | $ 15,700        | $ 0       | $ 15,900 | $ 0 |
| Auction rate securities                                                                                  | 2,208           | 3,240     |     |   |
| Duration of securities subject to temporary impairment, minimum (in months)                              | 12 months       |      |     |   |
| Amount of temporary impairment                                                                           | 192             | 260       |     |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]** |            |      |     |   |
| Amortized Cost Basis                                                                                     | 2,400           | 3,500     |     |   |
| Fair Value                                                                                               | 2,208           | 3,240     |     |   |
| Gross Unrealized Holding, Gains                                                                          | 0               | 0         |     |   |
| Gross Unrealized Holding, Losses                                                                         | (192)           | (260)     |     |   |
| Gross Unrealized Holding Gains (Losses), Net                                                             | (192)           | (260)     |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Number of securities with gross unrealized loss position                                                 | 1               | 2         |     |   |
| Weighted average duration of unrealized losses                                                           | 70 months       | 58 months |     |   |
| Contingent consideration liability                                                                       | 15,700          | 0         | 15,900   | 0 |
| Maximum [Member]                                                                                         |            |      |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Severity of the unrealized losses below amortized cost (in hundredths)                                   | 8.00%           | 8.00%     |     |   |
| Maturities Greater Than Ten Years [Member]                                                               |            |      |     |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |            |      |     |   |
| Amount of temporary impairment                                                                           | 192             | 200       |     |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]** |            |      |     |   |
| Amortized Cost Basis                                                                                     | 2,400           | 2,500     |     |   |
| Fair Value                                                                                               | 2,208           | 2,300     |     |   |
| Gross Unrealized Holding, Gains                                                                          | 0               | 0         |     |   |
| Gross Unrealized Holding, Losses                                                                         | (192)           | (200)     |     |   |
| Gross Unrealized Holding Gains (Losses), Net                                                             | (192)           | (200)     |     |   |
| Investments Without Stated Maturity Dates [Member]                                                       |            |      |     |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |            |      |     |   |
| Amount of temporary impairment                                                                           |            | 60        |     |   |
| **Summarize the amortized cost basis, the aggregate fair value and gross unrealized holding [Abstract]** |            |      |     |   |
| Amortized Cost Basis                                                                                     |            | 1,000     |     |   |
| Fair Value                                                                                               |            | 940       |     |   |
| Gross Unrealized Holding, Gains                                                                          |            | 0         |     |   |
| Gross Unrealized Holding, Losses                                                                         |            | (60)      |     |   |
| Gross Unrealized Holding Gains (Losses), Net                                                             |            | (60)      |     |   |
| U.S. Government Subsidized Securities [Member] | Minimum [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                                                                                  | 2,208           |      |     |   |
| Auction Rate Securities [Member]                                                                         |            |      |     |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |            |      |     |   |
| Auction rate securities                                                                                  | 2,208           | 3,240     |     |   |
| **Continuous unrealized loss position, Fair Value [Abstract]**                                           |            |      |     |   |
| Less than 12 Months, Fair Value                                                                          | 0               | 0         |     |   |
| 12 Months or Greater, Fair Value                                                                         | 2,208           | 3,240     |     |   |
| Total, Fair Value                                                                                        | 2,208           | 3,240     |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Less than 12 Months, Unrealized Losses                                                                   | 0               | 0         |     |   |
| 12 Months or Greater, Unrealized Losses                                                                  | (192)           | (260)     |     |   |
| Total, Unrealized Losses                                                                                 | (192)           | (260)     |     |   |
| Recurring [Member]                                                                                       |            |      |     |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |            |      |     |   |
| Contingent consideration liability                                                                       | 15,700          |      |     |   |
| Money market funds                                                                                       | 60,364          | 56,224    |     |   |
| Auction rate securities                                                                                  | 2,208           | 3,240     |     |   |
| Liability, total                                                                                         | 15,700          |      |     |   |
| Asset, total                                                                                             | 62,572          | 59,464    |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Contingent consideration liability                                                                       | 15,700          |      |     |   |
| 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]**         |            |      |     |   |
| Contingent consideration liability                                                                       | 0               |      |     |   |
| Money market funds                                                                                       | 60,364          | 56,224    |     |   |
| Auction rate securities                                                                                  | 0               | 0         |     |   |
| Liability, total                                                                                         | 0               |      |     |   |
| Asset, total                                                                                             | 60,364          | 56,224    |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Contingent consideration liability                                                                       | 0               |      |     |   |
| Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]                              |            |      |     |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |            |      |     |   |
| Contingent consideration liability                                                                       | 0               |      |     |   |
| Money market funds                                                                                       | 0               | 0         |     |   |
| Auction rate securities                                                                                  | 0               | 0         |     |   |
| Liability, total                                                                                         | 0               |      |     |   |
| Asset, total                                                                                             | 0               | 0         |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Contingent consideration liability                                                                       | 0               |      |     |   |
| Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]                                  |            |      |     |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**         |            |      |     |   |
| Contingent consideration liability                                                                       | 15,700          |      |     |   |
| Money market funds                                                                                       | 0               | 0         |     |   |
| Auction rate securities                                                                                  | 2,208           | 3,240     |     |   |
| Liability, total                                                                                         | 15,700          |      |     |   |
| Asset, total                                                                                             | 2,208           | 3,240     |     |   |
| **Continuous unrealized loss position, Unrealized Losses [Abstract]**                                    |            |      |     |   |
| Contingent consideration liability                                                                       | $ 15,700        |      |     |   |

| 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.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.
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| X                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents period of maturity of the securities held by the entity which are subject to temporary impairment upon valuation.
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| X                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents maturity period of securities held by the entity as on date of reporting.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Refers to period of weighted average duration of the unrealized losses.
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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.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.
+ References
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| - Definition
Amount of unrealized loss on securities classified as available-for-sale.
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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 unrealized loss on investments in available-for-sale securities that have been in a 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 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.
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| - Definition
Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.
+ References
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| - Definition
Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.
+ References
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| - Definition
Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.
+ References
No definition available.
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