| **Investments - Narrative (Details) - USD ($)**                                                       | 3 Months Ended | 6 Months Ended |               |
|-------------------------------------------------------------------------------------------------------|----------------|----------------|---------------|
||
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Debt securities                                                                                       | $ 193,576,000  |           | $ 193,576,000 |   |   |
| Realized losses from the sale of available-for-sale securities (less than for 2015)                   | 0              | $ 100,000      | 0             | $ 100,000 |   |
| Proceeds from sales of available-for-sale securities                                                  |           | $ 11,800,000   | 8,400,000     | 141,000,000 |   |
| Proceeds from maturity of available-for-sale securities                                               |           |           | 185,000,000   | $ 310,000,000 |   |
| Unrealized losses                                                                                     | 1,388,000      |           | 1,388,000     |   | $ 1,117,000 |
| U.S. Treasury Securities                                                                              |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| U.S. Treasury securities                                                                              | 174,600,000    |           | 174,600,000   |   |   |
| Corporate debt securities                                                                             |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Debt securities                                                                                       | 19,000,000     |           | 19,000,000    |   |   |
| Unrealized losses                                                                                     | 1,152,000      |           | 1,152,000     |   | 981,000 |
| Preferred stock                                                                                       |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Preferred stock investments                                                                           | 22,700,000     |           | 22,700,000    |   |   |
| Unrealized losses                                                                                     | 236,000        |           | 236,000       |   | $ 57,000 |
| Sears Holdings Corp or affiliates | Corporate debt securities                                         |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Debt securities                                                                                       | 8,500,000      |           | 8,500,000     |   |   |
| Sears Holdings Corp or affiliates | Preferred stock                                                   |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Preferred stock investments                                                                           | $ 200,000      |           | $ 200,000     |   |   |
| Required percent of investment account held in cash or cash equivalents | Minimum                     |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Investments, target portfolio allocations                                                             |           |           | 50.00%        |   |   |
| Other aggregated investments | Minimum | Securities of any one issuer (excluding the U.S. Government) |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Investments, portfolio allocations requiring additional consent                                       |           |           | 10.00%        |   |   |
| Other aggregated investments | Maximum | Securities of any one issuer (excluding the U.S. Government) |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Investments, target portfolio allocations                                                             |           |           | 15.00%        |   |   |
| Investments, portfolio allocations requiring additional consent                                       |           |           | 15.00%        |   |   |
| Investor | Fairholme Capital Management, L.L.C.                                                       |           |           |          |   |   |
| **Schedule of Available-for-sale Securities [Line Items]**                                            |           |           |          |   |   |
| Common stock ownership percentage                                                                     | 32.90%         |           | 32.90%        |   |   |

| X                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of common stock of the reporting entity owned by a third party.
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| - Definition
Investments, Portfolio Allocations Requiring Additional Consent
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Investments, Target Portfolio Allocations
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt securities categorized neither as held-to-maturity nor trading.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.
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| - Definition
Amount of debt and equity financial instruments classified as other and noncurrent.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt (bills, notes or bonds) that are issued by the government of the United States which are 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. 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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