Agreements with Related Parties (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Atradius NV [Member]	Dec. 31, 2011 Atradius NV [Member]	Dec. 31, 2013 ING Group N.V. [Member]	Dec. 31, 2012 ING Group N.V. [Member]
Related Party Transaction [Line Items]
Net premiums written	$ 80,292	$ 75,991
Net premiums earned	75,714	77,230	2,600	3,400
Losses and loss expenses and life policy benefits	35,197	32,595	1,300	800
Acquisition costs	28,475	33,906
Reinsurance balances receivable	11,974
Unpaid losses and loss expenses	82,711		12,900	12,700
Unearned premiums	40,312
Other net assets	$ 12,135