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Schedule IV 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
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Earned									$ 905,502us-gaap_DirectPremiumsEarned	$ 848,655us-gaap_DirectPremiumsEarned	$ 743,736us-gaap_DirectPremiumsEarned
Ceded Premiums Earned									61,017us-gaap_CededPremiumsEarned	67,291us-gaap_CededPremiumsEarned	40,398us-gaap_CededPremiumsEarned
Assumed Premiums Earned									43us-gaap_AssumedPremiumsEarned	56us-gaap_AssumedPremiumsEarned	(953)us-gaap_AssumedPremiumsEarned
Net premiums earned—insurance	$ 224,293us-gaap_PremiumsEarnedNet	$ 217,827us-gaap_PremiumsEarnedNet	$ 203,646us-gaap_PremiumsEarnedNet	$ 198,762us-gaap_PremiumsEarnedNet	$ 200,356us-gaap_PremiumsEarnedNet	$ 200,120us-gaap_PremiumsEarnedNet	$ 197,952us-gaap_PremiumsEarnedNet	$ 182,992us-gaap_PremiumsEarnedNet	$ 844,528us-gaap_PremiumsEarnedNet	$ 781,420us-gaap_PremiumsEarnedNet	$ 702,385us-gaap_PremiumsEarnedNet
Premiums, Percentage Assumed to Net									0.01%us-gaap_PremiumsPercentageAssumedToNet	0.01%us-gaap_PremiumsPercentageAssumedToNet	(0.14%)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.