ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	$ 1,983,018	$ 1,596,145	$ 1,262,596
Balance, end of period	2,495,837	1,983,018	1,596,145
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(28,168)	(32,666)	(38,961)
Foreign currency translation	(29,323)	5,802	7,912
Income tax benefit/(expense)	4,744	(1,304)	(1,617)
Other comprehensive (loss)/income	(24,579)	4,498	6,295
Balance, end of period	(52,747)	(28,168)	(32,666)
Cash flow hedging instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	3,642	1,292	(2,553)
Unrealized (loss)/gain in fair value	(13,781)	8,076	2,933
Net gain/(loss) reclassified into Cost of revenues (exclusive of depreciation and amortization)	4,649	(5,031)	2,028
Income tax benefit/(expense)	2,073	(695)	(1,116)
Other comprehensive (loss)/income	(7,059)	2,350	3,845
Balance, end of period	(3,417)	3,642	1,292
Defined benefit plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(986)	0	0
Income tax benefit/(expense)	(862)	289	0
Other comprehensive (loss)/income	2,943	(986)	0
Balance, end of period	1,957	(986)	0
Net actuarial gain/(loss) and prior service credit/(cost)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Net gain/(loss) reclassified into Cost of revenues (exclusive of depreciation and amortization)	3,805	(1,275)	0
Accumulated other comprehensive loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(25,512)	(31,374)	(41,514)
Balance, end of period	$ (54,207)	$ (25,512)	$ (31,374)