Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Trading securities	$ 12,712
Level 1 [Member]
Assets:
Trading securities	990
Level 2 [Member]
Assets:
Trading securities	11,722
Carrying Amount [Member]
Assets:
Fixed maturities	829,577	815,999
Equity securities	11,857	9,683
Short-term investments	76,502	57,417
Premiums receivable	12,712
Carrying Amount [Member] | Level 1 [Member]
Assets:
Cash and cash equivalents	20,224	43,481
Carrying Amount [Member] | Level 2 [Member]
Assets:
Trading securities	32,559	33,458
Reinsurance recoverable	183,562	173,982
Liabilities:
Loans payable	39,183	39,183
Estimated Fair Value [Member]
Assets:
Fixed maturities	829,577	815,999
Equity securities	11,857	9,683
Short-term investments	76,502	57,417
Premiums receivable	12,712
Estimated Fair Value [Member] | Level 1 [Member]
Assets:
Cash and cash equivalents	20,224	43,481
Estimated Fair Value [Member] | Level 2 [Member]
Assets:
Trading securities	32,559	33,458
Reinsurance recoverable	183,562	173,982
Liabilities:
Loans payable	$ 39,183	$ 39,183