Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 416 $ 1,092 $ 1,117
Additions 0 0 514
Deductions (Charge-offs) (140) (676) (539)
Balance at End of Year 276 416 1,092
Valuation allowance for deferred tax assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 46,517 39,932 33,876
Additions 6,734 6,585 6,056
Deductions (Charge-offs) 0 0 0
Balance at End of Year $ 53,251 $ 46,517 $ 39,932