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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivatives, Fair Value
Other comprehensive income (loss), cash flow hedge	$ 141	$ (1,228)	$ (159)	$ (2,205)
Gain (loss) on fair value of derivative instruments	2,398	(792)	(9,163)	(30,941)
Unrealized gain (loss) reclassified from accumulated other comprehensive income to interest expense	(141)	$ 1,228	159	$ 2,205
Loss to be reclassified to interest expense during next 12 months	10,059		10,059
Interest Rate Swap
Derivatives, Fair Value
Other comprehensive income (loss), cash flow hedge			330
Carrying (Reported) Amount, Fair Value Disclosure
Derivatives, Fair Value
Carrying value and estimated fair value of debt	1,112,492		1,112,492		$ 1,196,434
Estimate of Fair Value, Fair Value Disclosure
Derivatives, Fair Value
Carrying value and estimated fair value of debt	$ 1,141,023		$ 1,141,023		$ 1,176,625