Acquisitions Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								4 Months Ended	12 Months Ended
	Feb. 03, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Apr. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues											$ 487,117	$ 357,569	$ 280,230
Business Acquisition, Pro Forma Revenue											506,080	413,931
Business Acquisition, Pro Forma Net Income (Loss)											$ 13,885	$ 33,050
Business Acquisition, Pro Forma Earnings Per Share, Diluted											$ 0.64	$ 1.54
Net Income (Loss) Attributable to Parent		$ (10,517)	$ 3,423	$ 9,841	$ 2,951	$ 13,802	$ 8,083	$ 5,275	$ 198		$ 5,698	$ 27,358	$ 41,013
Earnings Per Share, Diluted		$ (0.49)	$ 0.16	$ 0.45	$ 0.14	$ 0.64	$ 0.38	$ 0.25	$ 0.01		$ 0.26	$ 1.28	$ 2.05
Family Security Holdings (FSH)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 1,127
Business Acquisition, Pro Forma Revenue												$ 358,696
Business Acquisition, Pro Forma Net Income (Loss)												$ 27,435
Net Income (Loss) Attributable to Parent	$ 77
Earnings Per Share, Diluted	$ 0.00											$ 1.28
Interboro Insurance Company
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues										$ 18,963		$ 56,362
Net Income (Loss) Attributable to Parent										$ 8,187		$ 5,692
Earnings Per Share, Diluted										$ 0.38		$ 0.26