Fair Value (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government obligations	$ 68,021	$ 70,742
Residential mortgage-backed securities	16,535	25,040
Commercial mortgage-backed securities	25,391	11,828
State and municipal obligations	113,251	194,865
Corporate securities	131,826	118,945
Options embedded in convertible securities	2,137	1,651
Foreign government obligations	21,942	22,598
Total fixed maturities	379,103	445,669
Equity securities	120,946	107,582
Short term	4,226	4,201
Cash equivalents	111,781	64,450
Total fair value	616,056	621,902
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government obligations	68,021	70,742
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	68,021	70,742
Equity securities	120,946	107,582
Short term	4,226	4,201
Cash equivalents	0	0
Total fair value	193,193	182,525
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. government obligations	0	0
Residential mortgage-backed securities	16,535	25,040
Commercial mortgage-backed securities	25,391	11,828
State and municipal obligations	113,251	194,865
Corporate securities	124,605	107,263
Options embedded in convertible securities	2,137	1,651
Foreign government obligations	21,942	22,598
Total fixed maturities	303,861	363,245
Equity securities	0	0
Short term	0	0
Cash equivalents	111,781	64,450
Total fair value	415,642	427,695
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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	7,221	11,682
Options embedded in convertible securities	0	0
Foreign government obligations	0	0
Total fixed maturities	7,221	11,682
Equity securities	0	0
Short term	0	0
Cash equivalents	0	0
Total fair value	$ 7,221	$ 11,682