Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Legal Fees
Related Party Transaction
Amounts of Transactions	$ 982	$ 871	$ 2,407	$ 2,513
Spouse of Executive Officer | Legal Fees
Related Party Transaction
Amounts of Transactions	491	436	$ 1,204	$ 1,257
Related party interest in billings (percentage)			50.00%
Director | AmRisc gross written premiums
Related Party Transaction
Amounts of Transactions	55,476	41,311	$ 277,239
Related party interest in billings (percentage)			7.70%
Director | AmRisc Fees and Commission
Related Party Transaction
Amounts of Transactions	18,162	12,011	$ 75,012
Director | AmRisc ceded premiums written
Related Party Transaction
Amounts of Transactions	750	640	4,116
Director | AmRisc Rent
Related Party Transaction
Amounts of Transactions	$ 5	$ 4	14
Director | AmRisc net premiums receivable
Related Party Transaction
Amounts of Transactions			$ 28,244