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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]
Gross Amounts									$ 66,027us-gaap_DirectPremiumsEarned	$ 44,530us-gaap_DirectPremiumsEarned	$ 34,028us-gaap_DirectPremiumsEarned
Ceded to Other Companies									453,658us-gaap_CededPremiumsEarned	412,415us-gaap_CededPremiumsEarned	430,374us-gaap_CededPremiumsEarned
Assumed									1,450,047us-gaap_AssumedPremiumsEarned	1,482,511us-gaap_AssumedPremiumsEarned	1,465,701us-gaap_AssumedPremiumsEarned
Net premiums earned (Note 7)	$ 256,487us-gaap_PremiumsEarnedNet	$ 258,979us-gaap_PremiumsEarnedNet	$ 260,416us-gaap_PremiumsEarnedNet	$ 286,534us-gaap_PremiumsEarnedNet	$ 256,765us-gaap_PremiumsEarnedNet	$ 294,717us-gaap_PremiumsEarnedNet	$ 291,889us-gaap_PremiumsEarnedNet	$ 271,255us-gaap_PremiumsEarnedNet	$ 1,062,416us-gaap_PremiumsEarnedNet	$ 1,114,626us-gaap_PremiumsEarnedNet	$ 1,069,355us-gaap_PremiumsEarnedNet
Percentage of Amount Assumed to Net									136.00%us-gaap_PremiumsPercentageAssumedToNet	133.00%us-gaap_PremiumsPercentageAssumedToNet	137.00%us-gaap_PremiumsPercentageAssumedToNet

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.