Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Reserves for Unpaid Losses and LAE	$ 661,203	$ 482,232	$ 140,855
Incurred Losses and LAE Current Year	404,271	368,148	281,365
Incurred Losses and LAE Prior Years	4,318	(2,613)	16,988
Paid Losses and LAE	401,815	351,406	273,476
Net Investment Income	26,170	17,126	10,092
Deferred Policy Acquisition Costs (DPAC)	105,582	103,882	65,473
Amortization of DPAC	225,900	171,915	115,847
Net Premiums Written	740,131	593,519	445,816
Net Premiums Earned	689,276	585,490	456,931
Unearned Premiums	$ 627,313	$ 555,873	$ 372,223