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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at Beginning of Year $ 1,935 $ 1,364 $ 996
Charged to Costs and Expenses (98) 977 569
Valuation Allowances and Reserves, Charged to Other Accounts (273) 406 201
Deductions 0 0 0
Balance at End of Year 2,110 1,935 1,364
Sales Returns and Allowances [Member]      
Valuation and qualifying accounts      
Balance at Beginning of Year 4,748 3,317 2,956
Charged to Costs and Expenses (182) 1,431 361
Valuation Allowances and Reserves, Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Year 4,566 4,748 3,317
Allowance for deferred tax assets      
Valuation and qualifying accounts      
Balance at Beginning of Year 11,617 13,254 11,114
Charged to Costs and Expenses 1,166 1,423 2,477
Valuation Allowances and Reserves, Charged to Other Accounts 0 0
Deductions (1,467) 3,060 337
Balance at End of Year $ 11,316 $ 11,617 $ 13,254