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Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents $ 153,194   $ 194,057  
Restricted cash - current 65,835   24,506  
Restricted cash - long-term 44,507   54,632  
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows 263,536 $ 248,787 273,195 $ 310,862
Inventories        
Materials and supplies inventory 71,300   68,100  
Hydrocarbons inventory 13,100   6,300  
Write down of materials and supplies 0 $ 15,709    
Restricted Cash | Petroleum agreements - performance guarantees        
Cash, Cash Equivalents and Restricted Cash        
Restricted cash - current 41,300   0  
Restricted cash - long-term 44,500   54,600  
Restricted Cash | Facility interest or the Senior Notes plus the Corporate Revolver interest        
Cash, Cash Equivalents and Restricted Cash        
Restricted cash - current $ 24,500   $ 24,500  
Restricted cash period required as per commercial debt facility to meet interest and commitment fee payments 6 months      
Kosmos BP Senegal Limited        
Investment in Corporate Joint Venture        
Ownership percentage 50.01%      
Senior Notes | 7.875% senior notes due 2021        
Cash, Cash Equivalents and Restricted Cash        
Interest rate 7.875%