Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 593	$ 549
Charged to Costs and Expenses	578	623
Deductions	(517)	(579)
Balance at end of period	654	593
Valuation allowance for deferred tax assets:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	1,235	2,569
Charged to Costs and Expenses	22	0
Deductions	0	(1,334)
Balance at end of period	$ 1,257	$ 1,235