Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fixed maturities [Abstract]
Total fixed maturities	$ 472,364	$ 437,184
Equity securities [Abstract]
Total equity securities	137,744	145,498
Short-term	1,500	2,220
Recurring [Member]
Fixed maturities [Abstract]
U.S. government obligations	109,031	103,245
Residential mortgage-backed securities	5,797	4,776
Commercial mortgage-backed securities	30,227	30,595
State and municipal obligations	125,098	110,578
Corporate securities	175,503	161,630
Options embedded in convertible securities	2,193	2,395
Foreign government obligations	24,515	23,965
Total fixed maturities	472,364	437,184
Equity securities [Abstract]
Financial institutions	24,918	21,694
Industrial & miscellaneous	112,826	123,804
Total equity securities	137,744	145,498
Short-term	1,500	2,220
Cash equivalents	56,517	69,517
Total fair value	668,125	654,419
Recurring [Member] | Level 1 [Member]
Fixed maturities [Abstract]
U.S. government obligations	0	0
Residential mortgage-backed securities	0	0
Commercial mortgage-backed securities	0	0
State and municipal obligations	0	0
Corporate securities	0	0
Options embedded in convertible securities	0	0
Foreign government obligations	0	0
Total fixed maturities	0	0
Equity securities [Abstract]
Financial institutions	24,918	21,694
Industrial & miscellaneous	112,826	123,804
Total equity securities	137,744	145,498
Short-term	1,500	2,220
Cash equivalents	0	0
Total fair value	139,244	147,718
Recurring [Member] | Level 2 [Member]
Fixed maturities [Abstract]
U.S. government obligations	109,031	103,245
Residential mortgage-backed securities	4,063	4,776
Commercial mortgage-backed securities	28,908	29,226
State and municipal obligations	125,098	110,578
Corporate securities	161,948	146,488
Options embedded in convertible securities	2,193	2,395
Foreign government obligations	24,228	23,683
Total fixed maturities	455,469	420,391
Equity securities [Abstract]
Financial institutions	0	0
Industrial & miscellaneous	0	0
Total equity securities	0	0
Short-term	0	0
Cash equivalents	56,517	69,517
Total fair value	511,986	489,908
Recurring [Member] | Level 3 [Member]
Fixed maturities [Abstract]
U.S. government obligations	0	0
Residential mortgage-backed securities	1,734	0
Commercial mortgage-backed securities	1,319	1,369
State and municipal obligations	0	0
Corporate securities	13,555	15,142
Options embedded in convertible securities	0	0
Foreign government obligations	287	282
Total fixed maturities	16,895	16,793
Equity securities [Abstract]
Financial institutions	0	0
Industrial & miscellaneous	0	0
Total equity securities	0	0
Short-term	0	0
Cash equivalents	0	0
Total fair value	$ 16,895	$ 16,793