v3.10.0.1

ACCOUNTS RECEIVABLE AND RELATED ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Accounts Receivable, Net [Abstract] |  |  |  |  |
Accounts receivable |  |  |  | $ 359,456 | $ 346,264
Allowance for doubtful accounts | $ (3,885) | $ (2,137) | $ (2,134) | (9,419) | (3,885)
Allowance for doubtful accounts and sales reserves |  |  |  | (16,690) | (4,275)
Accounts receivable, net of allowance for doubtful accounts |  |  |  | $ 342,766 | $ 341,989
Allowance for doubtful accounts |  |  |  |  |
Allowance for doubtful accounts | 3,885 | 2,137 | 2,134 |  |
Additions Charged to Costs and Expenses | 8,909 | 3,715 | 1,330 |  |
Deduction From Reserves | (3,375) | (1,967) | (1,327) |  |
Allowance for doubtful accounts | 9,419 | 3,885 | $ 2,137 |  |
Allowance for Sales Reserves |  |  |  |  |
Allowance for Sales Reserve | 390 |  |  |  |
Sales Reserve Expense | 14,254 | 390 |  |  |
Reduction in Sales Reseve | (7,373) | 0 |  |  |
Allowance for Sales Reserve | $ 7,271 | $ 390 |  |  |

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