Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Apr. 03, 2017	Dec. 31, 2016	Apr. 29, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid losses and loss adjustment expenses	$ 204,694	$ 117,013		$ 140,855		$ 76,792
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	53,319	13,775		18,724		2,114
Liability for Unpaid Claims and Claims Adjustment Expense, Net	151,375	103,238	$ 40,583	$ 122,131	$ 22,576	$ 74,678
Current Year Claims and Claims Adjustment Expense	152,061	121,693
Prior Year Claims and Claims Adjustment Expense	(1,790)	5,176
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	150,271	126,869
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	91,732	78,634
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	69,878	42,251
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	161,610	120,885
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount	94,608	67,388
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	$ 110,086	$ 49,625