Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense
Unpaid losses and loss adjustment expenses	$ 683,471	$ 577,349	$ 760,357	$ 661,203
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	398,369	379,402	482,315	477,870
Liability for Unpaid Claims and Claims Adjustment Expense, Net	285,102	197,947	$ 278,042	$ 183,333
Current Year Claims and Claims Adjustment Expense	206,482	199,832
Prior Year Claims and Claims Adjustment Expense	(1,952)	20,967
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	204,530	220,799
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	96,282	108,042
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	101,188	98,143
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	197,470	206,185
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount	307,425	257,873
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	$ 376,046	$ 319,476