Schedule V. Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for bad debts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 687	$ 1,239	$ 785
Charged to costs and expenses	94	0	454
Deductions	0	552	0
Balance at end of period	781	687	1,239
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	0	0	0
Charged to costs and expenses	0	0	0
Deductions	0	0	0
Balance at end of period	$ 0	$ 0	$ 0