PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid expense and other current assets
Bunkers and lubricants	$ 6,425	$ 7,522
Insurance claims receivable	4,420	5,047
Prepaid insurance	1,830	3,185
Other	11,209	11,857
Total	23,884	27,611
Insurance claims receivable included in Other noncurrent assets	0	588
Advances to third-party technical managers	$ 8,100	4,700
Prepaid expenses and other current assets | Navig8 Group
Prepaid expense and other current assets
Working capital due from Navig8		1,900
Gener8 Spyridon | Prepaid expenses and other current assets | Navig8 Group
Prepaid expense and other current assets
Working capital due from Navig8		900
Gener8 Ulysses | Prepaid expenses and other current assets | Navig8 Group
Prepaid expense and other current assets
Working capital due from Navig8		$ 1,000