Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Credit Losses - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 764	$ 261	$ 384
Charged to Expense	1,020	513	141
Charged to Other Accounts	4	152	(9)
(Write-offs) / Recoveries	(131)	(162)	(255)
Balance at End of Period	$ 1,657	$ 764	$ 261