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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivatives, Fair Value
Other comprehensive income (loss), cash flow hedge	$ (207)	$ (1,066)	$ (367)	$ (3,271)
Gain (loss) on fair value of derivative instruments	2,408	4,776	11,571	(26,164)
Unrealized gain (loss) reclassified from accumulated other comprehensive income to interest expense	207	$ 1,066	367	$ 3,271
Loss to be reclassified to interest expense during next 12 months	9,442		9,442
Interest Rate Swap
Derivatives, Fair Value
Other comprehensive income (loss), cash flow hedge			372
Carrying (Reported) Amount, Fair Value Disclosure
Derivatives, Fair Value
Carrying value and estimated fair value of debt	1,115,692		1,115,692		$ 1,196,434
Estimate of Fair Value, Fair Value Disclosure
Derivatives, Fair Value
Carrying value and estimated fair value of debt	$ 1,145,350		$ 1,145,350		$ 1,176,625