EQUITY - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 3,329,100	$ 3,383,063	$ 3,409,228	$ 3,364,340	$ 3,361,251	$ 3,488,460
Total accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(16,144)	$ (16,174)	(39,911)	$ (49,170)	$ (55,641)	$ (12,388)
Foreign currency translation loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,847)		(1,831)
Unrealized loss on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (14,297)		$ (38,080)