ACCUMULATED OTHER COMPREHENSIVE LOSS (Summary of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period		$ 3,238,126	$ 3,188,551
Other comprehensive income (loss) before reclassifications		(5,867)	8,271
(Gain) loss reclassified from accumulated other comprehensive loss to net income		(128)	(216)
Adjustment related to adoption of ASU 2018-02	[1]	0	(1,148)
Adjustment related to adoption of ASU 2017-12	[2]	0	(739)
Terminated swap amortization		(638)	0
Net current-period other comprehensive income (loss)		(6,633)	6,168
Balance at the end of the period		3,307,473	3,079,363
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period		(8,126)	(6,965)
Adjustment related to adoption of ASU 2018-02			(1,148)
Adjustment related to adoption of ASU 2017-12			(739)
Terminated swap amortization		(638)
Balance at the end of the period		$ (14,759)	$ (797)

[1] The Company adopted Accounting Standards Update ("ASU") 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018.

[2] The Company adopted ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, as of January 1, 2018.