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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 |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Period | $ 4,813 | $ 4,471 | $ 2,553
Charged to Costs and Expenses | 1,481 | 588 | 1,441
Net (Deductions) Recoveries | (1,113) | (246) | 477
Balance at End of Period | 5,181 | 4,813 | 4,471
Deferred tax asset valuation allowance |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Period | 445 | 3,994 | 356
Charged to Costs and Expenses |  |  | 3,638
Net (Deductions) Recoveries | 26 | (3,549) |
Balance at End of Period | 471 | 445 | 3,994
Reserve for obsolete or slow moving inventory |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Period | 10,169 | 3,875 | 3,052
Charged to Costs and Expenses | 6,467 | 8,088 | 5,869
Net (Deductions) Recoveries | (6,169) | (1,794) | (5,046)
Balance at End of Period | $ 10,467 | $ 10,169 | $ 3,875

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