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Debt (Revolving Credit) (Details) - USD ($)
12 Months Ended
Jul. 15, 2015
May. 28, 2015
Dec. 31, 2015
Apr. 27, 2015
Dec. 31, 2014
Dec. 16, 2014
Nov. 12, 2014
Nov. 11, 2014
Revolving Credit Facility                
Debt                
Borrowing base       $ 750,000,000   $ 1,000,000,000 $ 750,000,000 $ 700,000,000
Maximum commitment           2,000,000,000    
Forbearance fees $ 500,000              
Borrowings outstanding     $ 902,000,000   $ 545,000,000      
Weighted average interest rate (as a percent)     4.02%   2.40%      
Revolving Credit Facility | Minimum                
Debt                
Percentage of the PV-9 of the borrowing base properties on which obligations and the guarantees will be secured by a lien     80.00%          
Revolving Credit Facility | Alternate Base Rate | Minimum                
Debt                
Variable interest margin (as a percent)   0.50%            
Revolving Credit Facility | Alternate Base Rate | Maximum                
Debt                
Variable interest margin (as a percent)   1.50%            
Revolving Credit Facility | Variable Rate Base Adjusted Eurodollar | Minimum                
Debt                
Variable interest margin (as a percent)   1.50%            
Revolving Credit Facility | Variable Rate Base Adjusted Eurodollar | Maximum                
Debt                
Variable interest margin (as a percent)   2.50%            
Revolving Credit Facility | Federal Funds Effective rate                
Debt                
Variable interest margin (as a percent)   0.50%            
Revolving Credit Facility | Eurodollar rate                
Debt                
Variable interest margin (as a percent)   1.00%            
Letters of credit                
Debt                
Maximum commitment           $ 100,000,000    
Borrowings outstanding     $ 0   $ 29,000,000