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VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reserve for bad debts and allowances [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balances at beginning of period | $ 2,799 | $ 2,735 | $ 1,687
Charged to costs and expenses | 574 | 1,657 | 1,665
Charged to other accounts |  |  |
Charged to income | 2,020 | 1,593 | 617
Charged to other accounts |  |  |
Balances at end of period | 1,353 | 2,799 | 2,735
Valuation allowances on deferred tax assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balances at beginning of period | 152,659 | 152,062 | 201,376
Charged to costs and expenses |  | 597 | 22,998
Charged to other accounts |  |  |
Charged to income |  |  | 65,572
Charged to other accounts | 888 |  | 6,740
Balances at end of period | $ 151,771 | $ 152,659 | $ 152,062

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