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Schedule IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated earned premiums [Abstract]
Gross amount	$ 372,658us-gaap_DirectPremiumsEarned	$ 361,010us-gaap_DirectPremiumsEarned	$ 328,227us-gaap_DirectPremiumsEarned
Ceded to other companies	423,602us-gaap_CededPremiumsEarned	413,422us-gaap_CededPremiumsEarned	368,870us-gaap_CededPremiumsEarned
Assumed from other companies	591,666us-gaap_AssumedPremiumsEarned	567,918us-gaap_AssumedPremiumsEarned	499,489us-gaap_AssumedPremiumsEarned
Net amount	$ 540,722us-gaap_PremiumsEarnedNet	$ 515,506us-gaap_PremiumsEarnedNet	$ 458,846us-gaap_PremiumsEarnedNet
Percentage of amount assumed to net	109.40%us-gaap_PremiumsPercentageAssumedToNet	110.20%us-gaap_PremiumsPercentageAssumedToNet	108.90%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.