EQUITY METHOD INVESTMENTS (Results of Operations of Equity Method Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
EQUITY METHOD INVESTMENTS [Abstract]
Shipping revenues	$ 26,119	$ 53,470	$ 52,143	$ 105,785
Ship operating expenses	(14,241)	(27,958)	(28,481)	(54,327)
Income from vessel operations	11,878	25,512	23,662	51,458
Interest expense	(1,721)	(10,113)	(3,595)	(20,389)
Income tax (provision)/benefit	(944)	(814)	(1,867)	(1,668)
Net income	9,213	15,053	18,240	30,296
other	$ 0	$ 468	$ 40	$ 895