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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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