ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 602,956	$ 592,453	$ 1,836,636	$ 1,785,429
Benefit from (provision for) income taxes	(5,294)	(4,489)	(19,318)	(19,797)
Net income	1,796	25,015	26,470	91,783
Accumulated Other Comprehensive Income (Loss)
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			(2,046)	1,387
Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			(301)	0
Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			(2,012)	1,184
Reclassification from accumulated other comprehensive income
Presentation of Income Statement Reclassifications [Line Items]
Cost of services	(69)	(75)	(297)	(226)
Net Income (Loss) - Other	(62)	(67)	(267)	(203)
Reclassification from accumulated other comprehensive income | Tax effect
Presentation of Income Statement Reclassifications [Line Items]
Benefit from (provision for) income taxes	(347)	448	(707)	414
Provision for income taxes - Other	7	8	30	23
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net income	989	(1,276)	2,012	(1,184)
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Accumulated Other Comprehensive Income (Loss)
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net			$ 2,719	$ (1,598)
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 1,336	$ (1,724)