Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reinsurance [Abstract]
Premiums ceded to reinsurers	$ 32,073	$ 31,196	$ 63,336	$ 62,575
Losses and loss expenses ceded to reinsurers	19,520	21,840	48,845	38,238
Commissions from reinsurers	$ 9,914	$ 7,430	$ 20,688	$ 15,045