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Investments - Fair Values and Gross Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 316,639	$ 337,718
Gross Unrealized Gains	867	1,139
Gross Unrealized (Losses)	(3,051)	(2,356)
Fair Value	314,455	336,501
U.S. Treasury securities and obligations of U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,243	68,911
Gross Unrealized Gains	86	7
Gross Unrealized (Losses)	(106)	(573)
Fair Value	68,223	68,345
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,001	12,009
Gross Unrealized Gains	7	27
Gross Unrealized (Losses)	(24)	(73)
Fair Value	10,984	11,963
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	179,650	200,358
Gross Unrealized Gains	486	883
Gross Unrealized (Losses)	(2,793)	(1,456)
Fair Value	177,343	199,785
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	57,745	56,440
Gross Unrealized Gains	288	222
Gross Unrealized (Losses)	(128)	(254)
Fair Value	$ 57,905	$ 56,408

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

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