Percentage of common stock of the reporting entity owned by a third party.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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 accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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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.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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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 profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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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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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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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All other debt and equity financial instruments, which aren't categorized as available-for-sale, or held-to-maturity and which are not otherwise listed in the existing taxonomy, intended to be held longer than one year from the balance sheet date or the normal operating cycle, if longer.

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This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

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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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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 - Additional Information (Details) (USD $)	3 Months Ended
Investments - Additional Information (Details) (USD $)	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Money market funds	$ 23,400,000us-gaap_MoneyMarketFundsAtCarryingValue
Fair Value	633,734,000us-gaap_AvailableForSaleSecurities			636,878,000us-gaap_AvailableForSaleSecurities
Debt securities	609,476,000
Realized losses from the sale of available-for-sale securities	0
Sales of investments	128,272,000		2,621,000
Maturities of investments	125,000,000		25,000,000
Realized gains from the sale of available-for-sale securities			400,000
Unrealized losses	780,000			1,487,000
Other-than-temporary impairment losses		1,300,000
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value	248,354,000
Unrealized losses	0
US Government Agencies Debt Securities
Schedule of Available-for-sale Securities [Line Items]
US Government Securities, at Carrying Value	259,900,000
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	101,193,000			100,105,000
Debt securities	101,200,000
Unrealized losses	780,000			1,482,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	49,100,000			14,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	400,000			200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	52,100,000			85,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	400,000			1,300,000
Other Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Other Marketable Securities, Noncurrent	24,300,000
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	259,929,000			509,815,000
Unrealized losses	$ 0			$ 0
Minimum \| Required percent of investment account held in cash or cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Investments, target portfolio allocations	50.00%
Minimum \| Other aggregated investments \| 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%
Maximum \| Other aggregated investments \| 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	27.10%