Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 1,482,399	$ 1,602,904
Gross Unrealized Gains	1,913	1,582
Gross Unrealized Losses	(1,225)	(2,116)
Fair Value	1,483,087	1,602,370
Agency Securities [Member]
Investment [Line Items]
Amortized Cost	543,345	637,474
Gross Unrealized Gains	1,413	1,296
Gross Unrealized Losses	(207)	(457)
Fair Value	544,551	638,313
Corporate Securities [Member]
Investment [Line Items]
Amortized Cost	734,548	795,255
Gross Unrealized Gains	253	232
Gross Unrealized Losses	(1,003)	(1,372)
Fair Value	733,798	794,115
Municipal Securities [Member]
Investment [Line Items]
Amortized Cost	30,961	48,744
Gross Unrealized Gains	42	17
Gross Unrealized Losses	(11)	(31)
Fair Value	30,992	48,730
Government Securities [Member]
Investment [Line Items]
Amortized Cost	173,545	121,431
Gross Unrealized Gains	205	37
Gross Unrealized Losses	(4)	(256)
Fair Value	$ 173,746	$ 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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-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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