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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Year | $ 996 | $ 895 | $ 1,142
Charged to Costs and Expenses | 569 | 66 | (83)
Valuation Allowances and Reserves, Charged to Other Accounts | 201 | 0 | 0
Deductions | 0 | (35) | 164
Balance at End of Year | 1,364 | 996 | 895
Sales Returns and Allowances [Member] |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 2,956 | 3,050 | 2,706
Charged to Costs and Expenses | 361 | (94) | 344
Valuation Allowances and Reserves, Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance at End of Year | 3,317 | 2,956 | 3,050
Allowance for deferred tax assets |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Year | 11,114 | 6,868 | 7,575
Charged to Costs and Expenses | 2,477 | 5,765 | 358
Valuation Allowances and Reserves, Charged to Other Accounts |  | 0 | 0
Deductions | 337 | 1,519 | 1,065
Balance at End of Year | $ 13,254 | $ 11,114 | $ 6,868

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