Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Assets acquired:
Goodwill	$ 4,700
Other intangible assets	958
MICO [Member]
Assets acquired:
Investments	68,693
Premiums receivable	27,803
Prepaid reinsurance premiums	25,054
Reinsurance receivable	83,818
Goodwill	4,703
Other intangible assets	958
Other	2,801
Total assets acquired	213,830
Liabilities assumed:
Losses and loss expenses	104,815
Unearned premiums	33,688
Reinsurance balances payable	16,899
Accrued expenses	9,990
Other	6,142
Total liabilities assumed	171,534
Net assets acquired	$ 42,296