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Schedule 4 Reinsurance (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
ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract
Direct Amount									$ 2,633,433us-gaap_DirectPremiumsEarned	$ 2,482,527us-gaap_DirectPremiumsEarned	$ 2,396,756us-gaap_DirectPremiumsEarned
Ceded to other companies									616,702us-gaap_CededPremiumsEarned	576,631us-gaap_CededPremiumsEarned	505,742us-gaap_CededPremiumsEarned
Assumed from other companies									306,896us-gaap_AssumedPremiumsEarned	333,344us-gaap_AssumedPremiumsEarned	351,611us-gaap_AssumedPremiumsEarned
Net earned premium	$ 601,832us-gaap_PremiumsEarnedNet	$ 586,935us-gaap_PremiumsEarnedNet	$ 572,248us-gaap_PremiumsEarnedNet	$ 562,612us-gaap_PremiumsEarnedNet	$ 560,030us-gaap_PremiumsEarnedNet	$ 556,668us-gaap_PremiumsEarnedNet	$ 561,356us-gaap_PremiumsEarnedNet	$ 561,186us-gaap_PremiumsEarnedNet	$ 2,323,627us-gaap_PremiumsEarnedNet	$ 2,239,240us-gaap_PremiumsEarnedNet	$ 2,242,625us-gaap_PremiumsEarnedNet

Amount of earned premiums ceded to other entities.

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