CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
VOYAGE REVENUES:
Navig8 pool revenues	$ 292,975	$ 368,889	$ 149,642
Time charter revenues		9,278	28,707
Spot charter revenues	14,844	26,455	251,584
Total voyage revenues	307,819	404,622	429,933
OPERATING EXPENSES:
Voyage expenses	9,446	12,490	95,306
Direct vessel operating expenses	107,395	107,308	85,521
Navig8 charterhire expenses	6	3,059	11,324
General and administrative expenses	33,831	27,844	36,379
Depreciation and amortization	103,951	87,191	47,572
Goodwill impairment		23,297
Loss on impairment of vessels held for sale			520
Goodwill write-off for sales of vessels		2,994
Loss on disposal of vessels, net	139,836	24,169	805
Closing of Portugal office			507
Total operating expenses	394,465	288,352	277,934
OPERATING (LOSS) / INCOME	(86,646)	116,270	151,999
OTHER EXPENSES:
Interest expense, net	(82,764)	(49,627)	(15,982)
Other financing costs	(59)	(7)	(6,044)
Other income (expense), net	928	670	(404)
Total other expenses	(81,895)	(48,964)	(22,430)
NET (LOSS) / INCOME	$ (168,541)	$ 67,306	$ 129,569
(LOSS) / INCOME PER COMMON SHARE:
Basic (in dollars per share)	$ (2.03)	$ 0.81	$ 2.06
Diluted (in dollars per share)	$ (2.03)	$ 0.81	$ 2.05