Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Goodwill And Intangible Assets [Line Items]
Goodwill	$ 268,376	$ 268,376	$ 268,376
Indefinite-lived intangible assets, net carrying value	23,920	23,920	23,920
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	41,334	41,334	41,334
Accumulated amortization	(16,422)	(13,889)	(11,356)
Net carrying value	24,912	27,445	29,978
Amortization of intangible assets	(2,533)	(2,533)
Goodwill, Impaired, Accumulated Impairment Loss			156
Intangible Assets Accumulated Impairment Loss			6,866
U S Insurance [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Goodwill	264,459
Reinsurance [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Goodwill	$ 3,917