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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

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