ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	$ 1,529,331	$ 1,514,867	$ 1,341,803	$ 1,416,736	$ 1,514,867
Other comprehensive income (loss)					42,870
Less: Amounts reclassified from accumulated other comprehensive loss					18,774
Net current-period other comprehensive income (loss)	(6,336)	30,432	1,464	(28,187)	24,096
Balance, End of Period	1,574,981	1,529,331	1,349,096	1,341,803	1,574,981
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period	(43,627)	(74,059)	(104,588)	(76,401)	(74,059)
Net current-period other comprehensive income (loss)	(6,336)	30,432	1,464	(28,187)
Balance, End of Period	(49,963)	(43,627)	$ (103,124)	$ (104,588)	(49,963)
Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period		(82,249)			(82,249)
Other comprehensive income (loss)					47,885
Less: Amounts reclassified from accumulated other comprehensive loss					18,774
Net current-period other comprehensive income (loss)					29,111
Balance, End of Period	(53,138)				(53,138)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period		(5,105)			(5,105)
Other comprehensive income (loss)					228
Less: Amounts reclassified from accumulated other comprehensive loss					0
Net current-period other comprehensive income (loss)					228
Balance, End of Period	(4,877)				(4,877)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, Beginning of Period		$ 13,295			13,295
Other comprehensive income (loss)					(5,243)
Less: Amounts reclassified from accumulated other comprehensive loss					0
Net current-period other comprehensive income (loss)					(5,243)
Balance, End of Period	$ 8,052				$ 8,052