Liability for Unpaid Losses and Loss Adjustment Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Current Year Claims and Claims Adjustment Expense	$ 466,359	$ 404,271	$ 368,148
Prior Year Claims and Claims Adjustment Expense	(33,134)	(4,318)	(2,613)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	499,493	408,589	365,535
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	275,488	283,821	256,134
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	129,296	117,994	95,272
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	404,784	401,815	351,406
Liability for Unpaid Claims and Claims Adjustment Expense, Net	278,042	183,333	176,559
Reinsurance Recoverable on Unpaid Losses and LAE			305,673	$ 18,724
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Including Acquisition		183,333	176,559	122,131
Unpaid losses and loss adjustment expenses	760,357	661,203	482,232	$ 140,855
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount	300,858	270,601	236,253
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	$ 459,499	$ 390,602	$ 245,979