Fair Value (Details) - Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fixed maturities [Abstract]
U.S. government obligations	$ 119,957	$ 101,094
Residential mortgage-backed securities	5,676	6,066
Commercial mortgage-backed securities	32,695	36,440
State and municipal obligations	109,020	113,777
Corporate securities	144,157	164,068
Options embedded in convertible securities	2,683	2,898
Foreign government obligations	22,094	27,466
Total fixed maturities	436,282	451,809
Equity securities [Abstract]
Financial institutions	25,324	25,343
Industrial & miscellaneous	147,312	136,764
Total equity securities	172,636	162,107
Short-term	2,219	2,966
Cash equivalents	53,395	59,309
Total fair value	664,532	676,191
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	25,324	25,343
Industrial & miscellaneous	147,312	136,764
Total equity securities	172,636	162,107
Short-term	2,219	2,966
Cash equivalents	0	0
Total fair value	174,855	165,073
Level 2 [Member]
Fixed maturities [Abstract]
U.S. government obligations	119,957	101,094
Residential mortgage-backed securities	5,676	6,066
Commercial mortgage-backed securities	31,149	36,440
State and municipal obligations	109,020	113,777
Corporate securities	138,569	151,860
Options embedded in convertible securities	2,683	2,898
Foreign government obligations	22,094	27,466
Total fixed maturities	429,148	439,601
Equity securities [Abstract]
Financial institutions	0	0
Industrial & miscellaneous	0	0
Total equity securities	0	0
Short-term	0	0
Cash equivalents	53,395	59,309
Total fair value	482,543	498,910
Level 3 [Member]
Fixed maturities [Abstract]
U.S. government obligations	0	0
Residential mortgage-backed securities	0	0
Commercial mortgage-backed securities	1,546	0
State and municipal obligations	0	0
Corporate securities	5,588	12,208
Options embedded in convertible securities	0	0
Foreign government obligations	0	0
Total fixed maturities	7,134	12,208
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	$ 7,134	$ 12,208