Reinsurance (Schedule of Reinsurance Ceded and Recoveries) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Premium Written :
Direct	$ 549,077	$ 514,223	$ 473,233
Assumed			(15)
Ceded premiums written	(187,248)	(157,279)	(148,866)
Net premiums written	361,829	356,944	324,352
Premium Earned:
Direct	524,229	494,643	461,367
Assumed			327
Ceded	(170,859)	(145,562)	(140,477)
Premiums Earned, Net, Property and Casualty	353,370	349,081	321,217
Reinsurance recoveries	$ 116,057	$ 89,892	$ 99,911