Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Legal Fees
Related Party Transaction
Amounts of Transactions		$ 982		$ 2,407
Spouse of Executive Officer | Legal Fees
Related Party Transaction
Amounts of Transactions		491		1,204
Related party interest in billings (percentage)					50.00%
Director | AmRisc gross written premiums
Related Party Transaction
Amounts of Transactions	$ 58,867	55,476	$ 329,530	277,239
Related party interest in billings (percentage)			7.70%
Director | AmRisc Fees and Commission
Related Party Transaction
Amounts of Transactions	12,177	18,162	$ 87,170	75,012
Director | AmRisc ceded premiums written
Related Party Transaction
Amounts of Transactions	$ 1,066	$ 750	4,944	$ 4,116
Director | AmRisc net premiums receivable
Related Party Transaction
Amounts of Transactions			$ 32,010