ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 592,453	$ 566,734	$ 1,785,429	$ 1,660,747
Benefit from (provision for) income taxes	(4,489)	(7,939)	(19,797)	(35,271)
Net income	25,015	18,041	91,783	125,438
Accumulated Other Comprehensive Income (Loss)
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			1,387	(2,897)
Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other			1,184	(3,113)
Reclassification from accumulated other comprehensive income
Presentation of Income Statement Reclassifications [Line Items]
Cost of services	(75)	(80)	(226)	(240)
Net Income (Loss) - Other	(67)	(72)	(203)	(216)
Reclassification from accumulated other comprehensive income | Tax effect
Presentation of Income Statement Reclassifications [Line Items]
Benefit from (provision for) income taxes	448	(247)	414	(1,094)
Provision for income taxes - Other	8	8	23	24
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net income	(1,276)	700	(1,184)	3,113
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ (1,724)	$ 947	$ (1,598)	$ 4,207