Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Legal Fees
Related Party Transaction
Amounts of Transactions	$ 708	$ 868
Spouse of Executive Officer | Legal Fees
Related Party Transaction
Amounts of Transactions	$ 354	$ 434
Related party interest in billings (percentage)	50.00%
Director | AmRisc gross written premiums
Related Party Transaction
Amounts of Transactions	$ 94,005
Related party interest in billings (percentage)	7.70%
Director | AmRisc Fees and Commission
Related Party Transaction
Amounts of Transactions	$ 25,599
Director | AmRisc ceded premiums written
Related Party Transaction
Amounts of Transactions	1,561
Director | AmRisc Rent
Related Party Transaction
Amounts of Transactions	5
Director | AmRisc net premiums receivable
Related Party Transaction
Amounts of Transactions	$ 35,971