Fair Value (Details) - Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fixed maturities [Abstract]
U.S. government obligations	$ 110,095	$ 101,094
Residential mortgage-backed securities	5,116	6,066
Commercial mortgage-backed securities	29,601	36,440
State and municipal obligations	114,304	113,777
Corporate securities	160,087	164,068
Options embedded in convertible securities	2,207	2,898
Foreign government obligations	21,209	27,466
Total fixed maturities	442,619	451,809
Equity securities [Abstract]
Financial institutions	20,161	25,343
Industrial & miscellaneous	122,353	136,764
Total equity securities	142,514	162,107
Short-term	2,220	2,966
Cash equivalents	59,882	59,309
Total fair value	647,235	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	20,161	25,343
Industrial & miscellaneous	122,353	136,764
Total equity securities	142,514	162,107
Short-term	2,220	2,966
Cash equivalents	0	0
Total fair value	144,734	165,073
Level 2 [Member]
Fixed maturities [Abstract]
U.S. government obligations	110,095	101,094
Residential mortgage-backed securities	5,116	6,066
Commercial mortgage-backed securities	29,131	36,440
State and municipal obligations	114,304	113,777
Corporate securities	154,436	151,860
Options embedded in convertible securities	2,207	2,898
Foreign government obligations	20,925	27,466
Total fixed maturities	436,214	439,601
Equity securities [Abstract]
Financial institutions	0	0
Industrial & miscellaneous	0	0
Total equity securities	0	0
Short-term	0	0
Cash equivalents	59,882	59,309
Total fair value	496,096	498,910
Level 3 [Member]
Fixed maturities [Abstract]
U.S. government obligations	0	0
Residential mortgage-backed securities	0	0
Commercial mortgage-backed securities	470	0
State and municipal obligations	0	0
Corporate securities	5,651	12,208
Options embedded in convertible securities	0	0
Foreign government obligations	284	0
Total fixed maturities	6,405	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	$ 6,405	$ 12,208