DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	$ 432,213	$ 394,356
Other nonoperating income expense	3,396	798
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:	110	(1,845)
Designated as Hedging Instruments [Member] \| Foreign Exchange [Member] \| Cash Flow [Member] \| Reclassification from accumulated other comprehensive income
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	151	(2,527)
Not Designated as Hedging Instruments [Member] \| Foreign Exchange [Member] \| Fair Value [Member] \| Reclassification from accumulated other comprehensive income
Derivative Instruments, Gain (Loss) [Line Items]
Other nonoperating income expense	$ (330)	$ 248

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount of income (expense) related to nonoperating activities, classified as other.

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