Investments Maturity Distribution of Debt Securities (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Debt Maturities, Due in One Year or Less, Amortized Cost Basis			$ 37,022
Available-for-sale Securities, Debt Maturities, Due in One Year or Less, Fair Value			37,470
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis			124,548
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value			130,746
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis			98,026
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value			102,870
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis			443,059
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value			459,421
Fixed maturities available-for-sale, cost			702,655	$ 667,966
Available-for-sale Debt Securities, Fair Value			730,507	707,227
Held-to-maturity Securities, Debt Maturities, Due in One Year or Less, Amortized Cost Basis			12,549
Held-to-maturity Securities, Debt Maturities, Due in One Year or Less, Fair Value			12,599
Held-to-maturity Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis			33,016
Held-to-maturity Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value			34,625
Held-to-maturity Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis			49,514
Held-to-maturity Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value			51,249
Held-to-maturity Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis			141,107
Held-to-maturity Securities, Debt Maturities, Due After Ten Years, Fair Value			143,216
Fixed maturities held-to-maturity, at amortized cost (fair value: $241,689 and $232,891 in 2015 and 2014, respectively)			236,186	224,932
Held-to-maturity Securities, Fair Value			241,689	$ 232,891
Total Fixed maturity securities, Amortized Cost			938,841
Total Fixed Maturity Securities, Fair Value			$ 972,196
Sale of bonds, number of securities sold at a loss		0
Sale of bonds, number of held-to-maturity bonds sold	0	0