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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
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 Year $ 1,100 $ 1,201 $ 718
Additions, Charged to Costs and Expenses 502 0 483
Additions, Charged to Other Accounts 0 0 0
(Deductions) 0 (101) 0
Balance at End of Year 1,602 1,100 1,201
Deferred income tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 68,776 70,731 72,316
Additions, Charged to Costs and Expenses 0 0 0
Additions, Charged to Other Accounts 0 0 0
(Deductions) (4,977) (1,955) (1,585)
Balance at End of Year $ 63,799 $ 68,776 $ 70,731