DISCONTINUED OPERATIONS (Schedule of Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Nov. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shipping Revenues:
Time charter revenues										$ 266,193	$ 372,149	$ 385,206
Voyage charter revenues										124,233	90,271	81,666
Shipping revenues	$ 92,815	$ 93,270	$ 96,225	$ 108,116	$ 114,776	$ 114,180	$ 118,384	$ 115,080		390,426	462,420	466,872
Operating Expenses [Abstract]
Spin-off related costs									$ 12,264
Reorganization Items, net											131	5,659
Net (Loss)/Income					$ (340,153)	$ (45,884)	$ 34,045	$ 59,437		$ 0	(292,555)	203,395
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]
Shipping Revenues:
Pool revenues											226,329	360,218
Time charter revenues											88,786	52,092
Voyage charter revenues											50,005	85,324
Shipping revenues											365,120	497,634
Operating Expenses [Abstract]
Voyage expenses											11,219	21,844
Vessel expenses											129,914	143,925
Charter hire expenses											32,790	36,802
Depreciation and amortization											73,039	80,962
General and administrative											17,900	17,628
Technical management transition costs											0	39
Spin-off related costs											16,763	0
Severance costs											243	0
Loss/(gain) on disposal of vessels and other property, including impairments											382,163	(4,459)
Total Operating Expenses											664,031	296,741
(Loss)/Income from Vessel Operations											(298,911)	200,893
Equity in Income of Affiliated Companies											44,067	45,546
Operating (Loss)/Income											(254,844)	246,439
Other (Expense)\Income											(968)	66
(Loss)/Income before Interest Expense, Reorganization Items and Taxes											(255,812)	246,505
Interest expense											36,430	42,970
(Loss)/Income before Reorganization Items and Income Taxes											(292,242)	203,535
Reorganization Items, net											0	0
(Loss)/Income before Income Taxes											(292,242)	203,535
Income Tax Provision											313	140
Net (Loss)/Income											$ (292,555)	$ 203,395