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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at Beginning of Year $ 1,364 $ 996 $ 895
Charged to Costs and Expenses 977 569 66
Valuation Allowances and Reserves, Charged to Other Accounts 406 201 0
Deductions 0 0 (35)
Balance at End of Year 1,935 1,364 996
Sales Returns and Allowances [Member]      
Valuation and qualifying accounts      
Balance at Beginning of Year 3,317 2,956 3,050
Charged to Costs and Expenses 1,431 361 (94)
Valuation Allowances and Reserves, Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Year 4,748 3,317 2,956
Allowance for deferred tax assets      
Valuation and qualifying accounts      
Balance at Beginning of Year 13,254 11,114 6,868
Charged to Costs and Expenses 1,423 2,477 5,765
Valuation Allowances and Reserves, Charged to Other Accounts 0 0
Deductions 3,060 337 1,519
Balance at End of Year $ 11,617 $ 13,254 $ 11,114