BUSINESS AND SEGMENT REPORTING (Reconciliation of Income/(Loss) from Vessel Operations to Loss Before Reorganization) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total adjusted income/(loss) from vessel operations of all segments	$ 78,591	$ (110)	$ 136,864	$ 27,267
General and administrative expenses	(6,694)	(6,297)	(14,128)	(13,070)
Provision for credit losses	129	21	67	(1,277)
Third-party debt modification fees	0	0	(232)	(30)
Loss on disposal of vessels and other property, including impairments	(4,134)	(1,548)	(1,330)	(1,500)
Consolidated income/(loss) from vessel operations	67,892	(7,934)	121,241	11,390
Equity in income/(loss) of affiliated companies	5,205	8,015	10,316	16,085
Other income/(expense)	143	839	(13,289)	1,875
Interest expense	(8,881)	(17,443)	(20,890)	(34,976)
Income/(loss) before income taxes	64,359	(16,523)	97,378	(5,626)
Vessel Operations [Member]
Total adjusted income/(loss) from vessel operations of all segments	78,591	(110)	136,864	27,267
General and administrative expenses	(6,694)	(6,297)	(14,128)	(13,070)
Provision for credit losses	129	21	67	(1,277)
Third-party debt modification fees	0	0	(232)	(30)
Loss on disposal of vessels and other property, including impairments	(4,134)	(1,548)	(1,330)	(1,500)
Consolidated income/(loss) from vessel operations	67,892	(7,934)	121,241	11,390
Equity in income/(loss) of affiliated companies	5,205	8,015	10,316	16,085
Other income/(expense)	143	839	(13,289)	1,875
Interest expense	(8,881)	(17,443)	(20,890)	(34,976)
Income/(loss) before income taxes	$ 64,359	$ (16,523)	$ 97,378	$ (5,626)