Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Premiums Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 2,112	$ 1,977	$ 2,088
Additions amounts charged to expense	663	488	276
Deductions amounts written off or disposals	(160)	(353)	(387)
Balance at end of period	2,615	2,112	1,977
Valuation Allowance for Deferred Tax Assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	690	623	529
Additions amounts charged to expense	90	67	94
Deductions amounts written off or disposals	0	0	0
Balance at end of period	$ 780	$ 690	$ 623