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

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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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Investments - Narrative (Details)	3 Months Ended
Investments - Narrative (Details)	Mar. 31, 2017 USD ($) member	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of Investment Committee Members Required to Authorize Investment \| member	2
Debt securities	$ 132,785,000
Realized losses from the sale of available-for-sale securities (less than)	3,100,000	$ 0
Proceeds from sales of available-for-sale securities	57,100,000	8,500,000
Unrealized losses	1,755,000		$ 1,886,000
Other-than-temporary impairment loss	366,000	$ 0
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities	132,800,000
Unrealized losses	1,420,000		1,769,000
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Preferred stock investments	41,000,000
Unrealized losses	335,000		$ 111,000
Common Stock
Schedule of Available-for-sale Securities [Line Items]
Preferred stock investments	1,800,000
Unrealized losses	0
Sears Holdings Corp or affiliates \| Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities	8,500,000
Sears Holdings Corp or affiliates \| Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Preferred stock investments	$ 100,000
Required percent of investment account held in cash or cash equivalents \| Minimum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations	25.00%
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%
Other aggregated investments \| Maximum \| Single Issuer, exchange-traded common equities
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations	5.00%
Common stock investments \| Maximum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations, amount	$ 100,000,000.0
Common, preferred or other equity investments \| Maximum
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations	25.00%
Investor \| Fairholme Capital Management, L.L.C.
Schedule of Available-for-sale Securities [Line Items]
Common stock ownership percentage	33.75%