Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reinsurance [Abstract]
Premiums ceded to reinsurers	$ 30,996	$ 32,822	$ 94,331	$ 95,397
Losses and loss expenses ceded to reinsurers	21,237	21,068	70,081	59,306
Commissions from reinsurers	$ 11,898	$ 10,228	$ 32,587	$ 25,273