Schedule V. Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for bad debts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 785	$ 1,255	$ 1,255
Charged to costs and expenses	454	0	0
Deductions	0	470	0
Balance at end of period	1,239	785	1,255
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	0	329	718
Charged to costs and expenses	0	0	0
Deductions	0	329	389
Balance at end of period	$ 0	$ 0	$ 329