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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivatives, Fair Value
Gain (loss) on fair value of derivative instruments	$ 4,776	$ (1,121)	$ (26,164)	$ (9,276)
Unrealized gain (loss) reclassified from accumulated other comprehensive income to interest expense	1,066	$ 1,010	3,271	$ 3,263
Loss to be reclassified to interest expense during next 12 months	12,794		12,794
Old Swap
Derivatives, Fair Value
Fair value of old swap	67		67
Carrying (Reported) Amount, Fair Value Disclosure
Derivatives, Fair Value
Carrying value and estimated fair value of debt	1,195,021		1,195,021		$ 1,128,199
Estimate of Fair Value, Fair Value Disclosure
Derivatives, Fair Value
Carrying value and estimated fair value of debt	$ 1,172,381		$ 1,172,381		$ 1,098,082