ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 2,273,062	$ 1,949,248	$ 1,643,704
Benefit from (provision for) income taxes	(49,695)	(40,937)	(25,677)
Net income	158,189	129,331	84,734
Accumulated Other Comprehensive Income (Loss)
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other	(3,367)	(21,019)	3,283
Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other		(19,619)
Tax effect
Presentation of Income Statement Reclassifications [Line Items]
Provision for income taxes - Other	32	60	23
Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other	(3,655)	(1,928)	3,085
Cost of Services
Presentation of Income Statement Reclassifications [Line Items]
Cost of services	(320)	(588)	(221)
Reclassification from accumulated other comprehensive income
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other	(288)	(528)	(198)
Reclassification from accumulated other comprehensive income | Tax effect
Presentation of Income Statement Reclassifications [Line Items]
Benefit from (provision for) income taxes	(1,284)	(690)	1,143
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net income	3,655	1,928	(3,085)
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 4,939	$ 2,618	$ (4,228)