Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available-for-sale securities
Amortized cost, fixed maturities	$ 629,945
Amortized cost	638,894	$ 594,837
Gross unrealized gains	17,120	11,137
Gross unrealized losses	2,379	6,033
Estimated fair value, fixed maturities	644,521
Estimated fair value	653,635	599,941
Fixed maturities
Available-for-sale securities
Amortized cost, fixed maturities	629,945	581,972
Gross unrealized gains, fixed maturities	16,955	11,137
Gross unrealized losses, fixed maturities	2,379	5,900
Estimated fair value, fixed maturities	644,521	587,209
States & political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	227,669	221,093
Gross unrealized gains, fixed maturities	14,155	10,761
Gross unrealized losses, fixed maturities	0	7
Estimated fair value, fixed maturities	241,824	231,847
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	288,887	254,464
Gross unrealized gains, fixed maturities	2,361	281
Gross unrealized losses, fixed maturities	1,220	4,412
Estimated fair value, fixed maturities	290,028	250,333
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	14,125	13,639
Gross unrealized gains, fixed maturities	43	4
Gross unrealized losses, fixed maturities	139	130
Estimated fair value, fixed maturities	14,029	13,513
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	40,503	38,630
Gross unrealized gains, fixed maturities	292	30
Gross unrealized losses, fixed maturities	772	1,089
Estimated fair value, fixed maturities	40,023	37,571
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	56,761	51,905
Gross unrealized gains, fixed maturities	104	61
Gross unrealized losses, fixed maturities	232	221
Estimated fair value, fixed maturities	56,633	51,745
Other debt securities
Available-for-sale securities
Amortized cost, fixed maturities	2,000	2,241
Gross unrealized gains, fixed maturities	0	0
Gross unrealized losses, fixed maturities	16	41
Estimated fair value, fixed maturities	1,984	2,200
Common stock
Available-for-sale securities
Amortized cost, equity securities	8,949	12,865
Gross unrealized gains, equity securities	165	0
Gross unrealized losses, equity securities	0	133
Estimated fair value, equity securities	$ 9,114	$ 12,732

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