ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 604,250	$ 554,794	$ 1,192,976	$ 1,094,013
Benefit from (provision for) income taxes	(7,274)	(11,353)	(15,308)	(27,332)
Net income	28,798	52,373	66,768	107,397
Accumulated Other Comprehensive Income (Loss)
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			44	(2,269)
Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			(92)	(2,413)
Reclassification from accumulated other comprehensive income
Presentation of Income Statement Reclassifications [Line Items]
Cost of services	(75)	(80)	(151)	(160)
Net Income (Loss) - Other	(67)	(72)	(136)	(144)
Reclassification from accumulated other comprehensive income | Tax effect
Presentation of Income Statement Reclassifications [Line Items]
Benefit from (provision for) income taxes	50	(476)	(34)	(847)
Provision for income taxes - Other	8	8	15	16
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net income	(147)	1,354	92	2,413
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ (197)	$ 1,830	$ 126	$ 3,260