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SCHEDULE II - VALUATION ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts    
Valuation accounts    
Balance at Beginning of Period $ 1,730 $ 2,559
Additions Charged (Credited) to Expense 5 (829)
Net (Deductions) Recoveries (363) 0
Balance at End of Period 1,372 1,730
Deferred tax valuation allowance    
Valuation accounts    
Balance at Beginning of Period 153 652
Additions Charged (Credited) to Expense 315 (499)
Net (Deductions) Recoveries 0 0
Balance at End of Period $ 468 $ 153