Schedule II - Valuation and Qualifying Account (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Reserve for doubtful accounts, start	$ 4,068	$ 2,730	$ 2,650
Additions charged to / recovered from expense	(256)	1,618	594
Write-offs	(588)	(650)	(454)
Other	1	370	(60)
Reserve for doubtful accounts, end	$ 3,225	$ 4,068	$ 2,730