Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Credit Losses
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 50	$ 129	$ 168
Deductions Credited to Expenses or Other Accounts		(79)	(39)
Balance at End of Period	50	50	129
Deferred Tax Valuation Allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	55,951	45,494	45,496
Additions Charged to Expenses or Other Accounts	13,363	10,457
Deductions Credited to Expenses or Other Accounts			(2)
Balance at End of Period	$ 69,314	$ 55,951	$ 45,494