Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
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	311,309	829,577
Equity securities	6,112	11,857
Short-term investments	611,267	76,502
Trading securities		12,712
Carrying Amount [Member] | Level 1 [Member]
Assets:
Cash and cash equivalents	18,567	20,224
Carrying Amount [Member] | Level 2 [Member]
Assets:
Premiums receivable	29,249	32,559
Reinsurance recoverable	185,644	183,562
Liabilities:
Loans payable	39,183	39,183
Estimated Fair Value [Member]
Assets:
Fixed maturities	311,309	829,577
Equity securities	6,112	11,857
Short-term investments	611,267	76,502
Trading securities		12,712
Estimated Fair Value [Member] | Level 1 [Member]
Assets:
Cash and cash equivalents	18,567	20,224
Estimated Fair Value [Member] | Level 2 [Member]
Assets:
Premiums receivable	29,249	32,559
Reinsurance recoverable	185,644	183,562
Liabilities:
Loans payable	$ 39,183	$ 39,183