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DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Revenues | $ 394,356 | $ 375,249
Other nonoperating income expense | 798 | (11,516)
Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Cash Flow [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain or (loss) recognized in other comprehensive income (loss) - effective portion, net of tax: | (1,845) | (3,893)
Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Cash Flow [Member] | Reclassification from accumulated other comprehensive income | Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Revenues | (2,527) | (5,332)
Not Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Fair Value [Member] | Other income (expense), net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other nonoperating income expense | $ 248 | $ (3,352)

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