Acquisitions - Schedule of Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition
Revenues	$ 187,652	$ 171,128		$ 542,853	$ 471,834
Pro Forma Revenue					509,930
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (11,707)	$ (28,012)		$ 11,362	(16,856)
Pro Forma Net Income (Loss)					$ (10,144)
Diluted earnings per share	$ (0.27)	$ (0.66)		$ 0.27	$ (0.47)
Pro Forma Diluted Earnings Per Share (in usd per share)					$ (0.24)
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