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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | $ 4,471 | $ 2,553 | $ 10,605
Charged to Costs and Expenses |  | 588 | 1,441 | 6,021
Net (Deductions) Recoveries | [1] | (246) | 477 | (14,073)
Balance at End of Period |  | 4,813 | 4,471 | 2,553
Deferred tax asset valuation allowance |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 3,994 | 356 | 276
Charged to Costs and Expenses | [2] | 0 | 3,638 | 80
Net (Deductions) Recoveries |  | (3,549) | 0 | 0
Balance at End of Period |  | 445 | 3,994 | 356
Reserve for obsolete or slow moving inventory |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 3,875 | 3,052 | 2,588
Charged to Costs and Expenses |  | 8,088 | 5,869 | 6,401
Net (Deductions) Recoveries | [3] | (1,794) | (5,046) | (5,937)
Balance at End of Period |  | $ 10,169 | $ 3,875 | $ 3,052
[1] | Net (deductions) recoveries in the allowance for doubtful accounts principally reflect the write-off of previously reserved accounts net of recoveries.
[2] | The valuation allowance for deferred tax assets is increased or decreased each year to reflect the state net operating losses, foreign tax credits and capital losses that management believes will not be utilized before they expire.
[3] | Net (deductions) recoveries in the reserve for obsolete or slow moving inventory principally reflect the write-off and/ or disposal of previously reserved inventory.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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