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PREPAID EXPENSES AND OTHER CURRENT AND NONCURRENT ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
PREPAID EXPENSES AND OTHER CURRENT AND NONCURRENT ASSETS    
Lubricant inventory, fuel oil and diesel oil inventory and other stores $ 10,517 $ 10,478
Prepaid items 4,252 3,917
Insurance receivable 1,537 2,738
Other 2,839 4,236
Total prepaid expenses and other current assets 19,145 21,369
Security deposit related to operating lease included in other noncurrent assets $ 514 $ 514