ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Summary of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period		$ 3,238,126	$ 3,188,551	$ 2,571,510
Other comprehensive income (loss) before reclassifications		(19,318)	2,120
Adjustment related to adoption of ASU 2018-02	[1]	0	(1,148)	0
Adjustment related to adoption of ASU 2017-12	[2]	0	(739)	0
Net current-period other comprehensive income (loss)		(21,246)	(1,161)
Balance at the end of the period		3,332,988	3,238,126	3,188,551
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the period		(8,126)	(6,965)	(6,786)
Adjustment related to adoption of ASU 2018-02			(1,148)
Balance at the end of the period		(29,372)	(8,126)	$ (6,965)
(Gain) loss reclassified from accumulated other comprehensive loss to net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification		770	(1,135)
Pension adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification		11	759
Terminated swap amortization
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification		$ (2,709)	$ (1,018)

[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.