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Deferred Acquisition Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in deferred acquisition costs
Beginning balance	$ 24,521us-gaap_DeferredPolicyAcquisitionCosts	$ 20,600us-gaap_DeferredPolicyAcquisitionCosts	$ 18,637us-gaap_DeferredPolicyAcquisitionCosts
Costs deferred	33,126	32,359	28,993
Amortization	(31,212)	(28,438)	(27,030)
Ending balance	$ 26,435us-gaap_DeferredPolicyAcquisitionCosts	$ 24,521us-gaap_DeferredPolicyAcquisitionCosts	$ 20,600us-gaap_DeferredPolicyAcquisitionCosts

Amount of expense related to deferred policy acquisition costs.

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.