Investments Classified by Maturity Date (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis, Percent of Total	9.50%
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value, Percent of Total	9.50%
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis, Percent of Total	47.60%
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value, Percent of Total	47.30%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis, Percent of Total	31.90%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value, Percent of Total	32.00%
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis, Percent of Total	10.90%
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value, Percent of Total	11.20%
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Percent of Total	100.00%
Available-for-sale Securities, Fair Value Disclosure	$ 381,627us-gaap_AvailableForSaleSecurities	$ 291,660us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Fair Value Disclosure, Percent of Total	100.00%
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	33,363
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	33,377
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	166,606
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	166,768
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	111,842
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	112,970
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	38,252
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	39,515
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	350,063
Available-for-sale Securities, Fair Value Disclosure	$ 352,630	$ 273,024

Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis, Percent of Total

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