Fair Value (Details) - Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fixed maturities [Abstract]
U.S. government obligations	$ 128,428	$ 103,245
Residential mortgage-backed securities	4,534	4,776
Commercial mortgage-backed securities	32,374	30,595
State and municipal obligations	111,882	110,578
Corporate securities	166,188	161,630
Options embedded in convertible securities	2,205	2,395
Foreign government obligations	25,372	23,965
Total fixed maturities	470,983	437,184
Equity securities [Abstract]
Financial institutions	23,150	21,694
Industrial & miscellaneous	114,893	123,804
Total equity securities	138,043	145,498
Short-term	2,215	2,220
Cash equivalents	42,311	69,517
Total fair value	653,552	654,419
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	23,150	21,694
Industrial & miscellaneous	114,893	123,804
Total equity securities	138,043	145,498
Short-term	2,215	2,220
Cash equivalents	0	0
Total fair value	140,258	147,718
Level 2 [Member]
Fixed maturities [Abstract]
U.S. government obligations	128,428	103,245
Residential mortgage-backed securities	4,534	4,776
Commercial mortgage-backed securities	30,967	29,226
State and municipal obligations	111,882	110,578
Corporate securities	151,589	146,488
Options embedded in convertible securities	2,205	2,395
Foreign government obligations	25,076	23,683
Total fixed maturities	454,681	420,391
Equity securities [Abstract]
Financial institutions	0	0
Industrial & miscellaneous	0	0
Total equity securities	0	0
Short-term	0	0
Cash equivalents	42,311	69,517
Total fair value	496,992	489,908
Level 3 [Member]
Fixed maturities [Abstract]
U.S. government obligations	0	0
Residential mortgage-backed securities	0	0
Commercial mortgage-backed securities	1,407	1,369
State and municipal obligations	0	0
Corporate securities	14,599	15,142
Options embedded in convertible securities	0	0
Foreign government obligations	296	282
Total fixed maturities	16,302	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	$ 16,302	$ 16,793