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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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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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Amount of debt and equity financial instruments classified as other and noncurrent.

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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.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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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.

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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.

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Investments - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
Investments - Narrative (Details) - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
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%