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BUSINESS ACQUISITION - Purchase Consideration (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 18, 2012
Bluewater Gandria
Jul. 31, 2008
Bluewater Gandria
Business acquisition:          
Fair value of previously held 50% equity interest       $ 19,500  
Purchase consideration - cash       19,500  
Total assumed acquisition consideration       39,000 22,000
Less: Fair value of net assets acquired:          
Vessel and equipment, net       40,000  
Inventories       931  
Cash       62  
Prepayments       40  
Other liabilities       (100)  
Subtotal       (40,933)  
Gain on bargain purchase of Bluewater Gandria $ (4,084) $ 0 $ 0 $ (1,933)