ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		$ 2,487,117			$ 2,487,117
Other comprehensive income/(loss)	$ 9,793	(31,943)	$ 11,677	$ (15,238)	(22,150)	$ (3,561)
Ending balance	2,622,353				2,622,353
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(83,299)	(52,747)	(38,699)	(28,168)	(52,747)	(28,168)
Foreign currency translation	22,977		12,088		(13,138)	(1,493)
Income tax (expense)/ benefit	(8,147)		(2,451)		(2,584)	599
Other comprehensive income/(loss)	14,830		9,637		(15,722)	(894)
Ending balance	(68,469)	(83,299)	(29,062)	(38,699)	(68,469)	(29,062)
Cash flow hedging instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,808)	(3,417)	(439)	3,642	(3,417)	3,642
Unrealized (loss)/ gain in fair value	(11,048)		1,271		(57,605)	(6,075)
Net loss reclassified into Cost of revenues (exclusive of depreciation and amortization) and Actuarial loss	4,557		1,371		5,461	3,437
Net (gain)/ loss reclassified into Foreign exchange loss	(26)		0		43,828	0
Income tax (expense)/ benefit	1,480		(602)		1,888	597
Other comprehensive income/(loss)	(5,037)		2,040		(6,428)	(2,041)
Ending balance	(9,845)	(4,808)	1,601	(439)	(9,845)	1,601
Defined benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,957	1,957	(1,612)	(986)	1,957	(986)
Income tax (expense)/ benefit	0		0		0	185
Other comprehensive income/(loss)	0		0		0	(626)
Ending balance	1,957	1,957	(1,612)	(1,612)	1,957	(1,612)
Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net loss reclassified into Cost of revenues (exclusive of depreciation and amortization) and Actuarial loss	0		0		0	(811)
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income/(loss)	9,793	$ (31,943)	11,677	$ (15,238)
Ending balance	$ (76,357)		$ (29,073)		$ (76,357)	$ (29,073)