Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Legal Fees
Related Party Transaction
Amounts of Transactions	$ 717	$ 775	$ 1,425	$ 1,643
Spouse of Executive Officer | Legal Fees
Related Party Transaction
Amounts of Transactions	359	388	$ 713	$ 822
Related party interest in billings (percentage)			50.00%
Director | AmRisc gross written premiums
Related Party Transaction
Amounts of Transactions	127,757	110,310	$ 221,763
Related party interest in billings (percentage)			7.70%
Director | AmRisc Fees and Commission
Related Party Transaction
Amounts of Transactions	34,737	16,823	$ 59,166
Director | AmRisc ceded premiums written
Related Party Transaction
Amounts of Transactions	1,805	1,772	3,366
Director | AmRisc Rent
Related Party Transaction
Amounts of Transactions	$ 5	$ 16	9
Director | AmRisc net premiums receivable
Related Party Transaction
Amounts of Transactions			$ 67,842