EQUITY - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	$ 3,260,376	$ 3,050,778	$ 3,254,747	$ 3,407,925	$ 3,426,566	$ 3,437,249
Total accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(10,936)	$ (1,747)	12,301	$ 24,412	$ 20,813	$ 11,289
Foreign currency translation loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(2,186)		(2,193)
Unrealized (loss) gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	$ (8,750)		$ 14,494