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DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Sales Revenue Services Net | $ 554,794 | $ 453,081 | $ 1,094,013 | $ 885,294
Other nonoperating income expense | 1,047 | (1,761) | 249 | 1,635
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: | 1,354 | 58 | 2,413 | 168
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 | 1,830 | 79 | 3,260 | 230
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 | $ 375 | $ (14) | $ 38 | $ (343)

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