DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	$ 2,462,817	$ 2,443,707	$ 2,273,062
Other nonoperating income expense	(4,126)	10,161	$ 2,315
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:	2,934	(2,152)
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	3,964	(2,906)
Not Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Fair Value [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other nonoperating income expense	$ 1,882	$ 827