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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 1,201 $ 718 $ 695
Additions, Charged to Costs and Expenses 0 483 23
Additions, Charged to Other Accounts 0 0 0
(Deductions) (101) 0 0
Balance at End of Year 1,100 1,201 718
Deferred income tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 70,731 72,316 68,469
Additions, Charged to Costs and Expenses 0 0 0
Additions, Charged to Other Accounts 0 0 3,847
(Deductions) (1,955) (1,585) 0
Balance at End of Year $ 68,776 $ 70,731 $ 72,316