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Investments - Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Amortized Cost, Due in one year or less	$ 17,951	$ 6,110
Amortized Cost, Due after one through five years	149,970	195,492
Amortized Cost, Due after five through ten years	72,232	54,360
Amortized Cost, Due after ten years	18,741	25,316
Amortized Cost, Total Investments	316,639	337,718
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Fair Value, Due in one year or less	17,971	6,125
Fair Value, Due after one through five years	150,086	194,472
Fair Value, Due after five through ten years	70,149	53,891
Fair Value Due after ten years	18,344	25,605
Fair Value, Total Investments	314,455	336,501
Asset-backed securities
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Amortized Cost, Total Investments	57,745	56,440
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Fair Value, Total Investments	$ 57,905	$ 56,408

X

- Definition

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

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