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VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reserve for bad debts and allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balances at beginning of period | $ 2,735 | $ 1,687 | $ 1,357
Charged to costs and expenses | 1,657 | 1,665 | 991
Charged to other accounts |  |  |
Charged to income | 1,593 | 617 | 661
Charged to other accounts |  |  |
Balances at end of period | 2,799 | 2,735 | 1,687
Valuation allowances on deferred tax assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balances at beginning of period | 152,062 | 201,376 | 152,115
Charged to costs and expenses | 597 | 22,998 | 49,261
Charged to other accounts |  |  |
Charged to income |  | 65,572 |
Charged to other accounts |  | 6,740 |
Balances at end of period | $ 152,659 | $ 152,062 | $ 201,376

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