Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fixed maturities [Abstract]
Total fixed maturities	$ 486,137	$ 437,184
Equity securities [Abstract]
Total equity securities	134,454	145,498
Short-term	1,500	2,220
Recurring [Member]
Fixed maturities [Abstract]
U.S. government obligations	96,573	103,245
Residential mortgage-backed securities	5,608	4,776
Commercial mortgage-backed securities	29,809	30,595
State and municipal obligations	131,697	110,578
Corporate securities	194,033	161,630
Options embedded in convertible securities	3,644	2,395
Foreign government obligations	24,773	23,965
Total fixed maturities	486,137	437,184
Equity securities [Abstract]
Financial institutions	20,251	21,694
Industrial & miscellaneous	114,203	123,804
Total equity securities	134,454	145,498
Short-term	1,500	2,220
Cash equivalents	62,812	69,517
Total fair value	684,903	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	20,251	21,694
Industrial & miscellaneous	114,203	123,804
Total equity securities	134,454	145,498
Short-term	1,500	2,220
Cash equivalents	0	0
Total fair value	135,954	147,718
Recurring [Member] | Level 2 [Member]
Fixed maturities [Abstract]
U.S. government obligations	96,573	103,245
Residential mortgage-backed securities	3,874	4,776
Commercial mortgage-backed securities	28,418	29,226
State and municipal obligations	131,697	110,578
Corporate securities	178,588	146,488
Options embedded in convertible securities	3,644	2,395
Foreign government obligations	24,493	23,683
Total fixed maturities	467,287	420,391
Equity securities [Abstract]
Financial institutions	0	0
Industrial & miscellaneous	0	0
Total equity securities	0	0
Short-term	0	0
Cash equivalents	62,812	69,517
Total fair value	530,099	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	1,391	1,369
State and municipal obligations	0	0
Corporate securities	15,445	15,142
Options embedded in convertible securities	0	0
Foreign government obligations	280	282
Total fixed maturities	18,850	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	$ 18,850	$ 16,793