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DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Sales Revenue Services Net | $ 392,515 | $ 349,853 | $ 786,871 | $ 725,102
Other nonoperating income expense | 1,865 | (259) | 2,663 | (11,775)
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: | (738) | (3,565) | (2,583) | (7,458)
Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Cash Flow [Member] | Reclassification from accumulated other comprehensive income | Revenue |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Sales Revenue Services Net | (1,011) | (4,883) | (3,538) | (10,215)
Not Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Fair Value [Member] | Reclassification from accumulated other comprehensive income | Other income (expense), net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other nonoperating income expense | $ (1,465) | $ (2,343) | $ (1,217) | $ (5,695)

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