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Financing Agreements - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 16, 2015
Jan. 08, 2015
Dec. 31, 2014
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 29, 2015
Debt Instrument [Line Items]                  
Capital lease obligations                 $ 6,000,000
Loss on extinguishment of debt         $ (2,000,000)  
Revolving Facility [Member]                  
Debt Instrument [Line Items]                  
Current aggregate facility       $ 500,000,000     $ 500,000,000    
Line of credit facility, unused capacity, benchmark             50.00%    
Line of credit facility, maximum letters of credit       300,000,000     $ 300,000,000    
Fronting fee rate             0.125%    
Line of credit facility, amount outstanding       0     $ 0    
Utilized for letters of credit       40,000,000     40,000,000    
Borrowing base collateral       389,000,000     389,000,000    
Available borrowing capacity       $ 349,000,000     $ 349,000,000    
Revolving Facility [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Commitment fee rate             0.25%    
Revolving Facility [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Commitment fee rate             0.375%    
Senior Notes Due December 2024 [Member]                  
Debt Instrument [Line Items]                  
Senior notes issued     $ 425,000,000            
Net proceeds of the offering     418,000,000            
Financing costs     7,000,000            
Senior Notes Due February 2019 [Member]                  
Debt Instrument [Line Items]                  
Senior notes redeemed $ 15,000,000 $ 40,000,000 $ 345,000,000            
Weighted average debt redemption price 103.25% 103.00% 104.116%            
Loss on extinguishment of debt     $ 19,000,000   $ 2,000,000        
Write-off of deferred financing cost     $ 4,000,000