Loss and Loss Adjustment Expense Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss and Loss Adjustment Expense Reserves
Reserves for losses and LAE at beginning of year	$ 553,977	$ 482,012	$ 455,014
Less receivable from reinsurers related to unpaid losses and LAE	(68,261)	(61,245)	(60,346)
Net reserves for losses and LAE at beginning of year	485,716	420,767	394,668
Incurred losses and LAE, related to:
Current Year	538,881	642,882	513,734
Prior Years	(45,448)	(30,313)	(37,368)
Total incurred losses and LAE	493,433	612,569	476,366
Paid losses and LAE related to:
Current year	328,046	415,256	316,979
Prior years	174,506	132,364	133,288
Total paid losses and LAE	502,552	547,620	450,267
Net reserves for losses and LAE at end of period	476,597	485,716	420,767
Plus receivable from reinsurers related to unpaid losses and LAE	83,724	68,261	61,245
Reserves for losses and LAE at end of period	560,321	553,977	482,012
Reduction in retained automobile reserves	25,019	18,644	23,272
Reduction in retained homeowners reserves	$ 11,648	$ 7,964	$ 8,804