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PREPAID EXPENSES AND OTHER CURRENT AND NONCURRENT ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
PREPAID EXPENSES AND OTHER CURRENT AND NONCURRENT ASSETS    
Lubricant inventory, fuel oil and diesel oil inventory and other stores $ 11,459 $ 11,018
Prepaid items 4,552 4,638
Insurance receivable 2,474 1,951
Other 4,131 4,816
Total prepaid expenses and other current assets 22,616 22,423
Security deposit related to operating lease included in other noncurrent assets $ 514 $ 514