Schedule IV Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Earned									$ 973,645	$ 905,502	$ 848,655
Ceded Premiums Earned									57,780	61,017	67,291
Assumed Premiums Earned									43	43	56
Net premiums earned—insurance	$ 226,443	$ 227,433	$ 237,437	$ 224,595	$ 224,293	$ 217,827	$ 203,646	$ 198,762	$ 915,908	$ 844,528	$ 781,420
Premiums, Percentage Assumed to Net									0.00%	0.01%	0.01%