Other Operating Expenses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Operating Expenses [Abstract]
Amortization of gross deferred policy acquisition costs	$ 47,414	$ 41,957	$ 40,712
Other underwriting expenses	35,281	27,242	25,290
Expense allowances from reinsurers	(20,822)	(15,185)	(11,503)
Total underwriting expenses	61,873	54,014	54,499
Operating expenses of non-insurance companies	23,488	23,416	18,829
Total other operating expenses	$ 85,361	$ 77,430	$ 73,328