Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 1,336,488	$ 1,602,904
Gross Unrealized Gains	1,989	1,582
Gross Unrealized Losses	(1,009)	(2,116)
Fair Value	1,337,468	1,602,370
Agency securities [Member]
Investment [Line Items]
Amortized Cost	577,539	637,474
Gross Unrealized Gains	1,422	1,296
Gross Unrealized Losses	(80)	(457)
Fair Value	578,881	638,313
Corporate securities [Member]
Investment [Line Items]
Amortized Cost	679,887	795,255
Gross Unrealized Gains	396	232
Gross Unrealized Losses	(928)	(1,372)
Fair Value	679,355	794,115
Municipal securities [Member]
Investment [Line Items]
Amortized Cost	15,466	48,744
Gross Unrealized Gains	28	17
Gross Unrealized Losses	(1)	(31)
Fair Value	15,493	48,730
Government securities [Member]
Investment [Line Items]
Amortized Cost	63,596	121,431
Gross Unrealized Gains	143	37
Gross Unrealized Losses	0	(256)
Fair Value	$ 63,739	$ 121,212

Line items represent reporting 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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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