Acquisitions - Schedule of Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition
Revenues	$ 183,148	$ 178,073		$ 355,201	$ 300,706
Pro Forma Revenue					338,802
Net Income (loss)	$ 14,701	$ 7,257		$ 23,069	11,156
Pro Forma Net Income (Loss)					$ 17,868
Diluted earnings per share (in usd per share)	$ 0.34	$ 0.17		$ 0.54	$ 0.35
Pro Forma Diluted Earnings Per Share (in usd per share)					$ 0.42
American Coastal Insurance Company
Business Acquisition
Pro Forma Revenue			$ 38,096
Pro Forma Net Income (Loss)			$ 6,712
Pro Forma Diluted Earnings Per Share (in usd per share)			$ 0