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Financing Agreements - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 16, 2015
Jan. 08, 2015
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]        
Loss on extinguishment of debt     $ (2,000,000)
Revolving Facility [Member]        
Debt Instrument [Line Items]        
Current aggregate facility     $ 500,000,000  
Line of credit facility, unused capacity, benchmark     50.00%  
Line of credit facility, maximum letters of credit     $ 300,000,000  
Fronting fee rate     0.125%  
Line of credit facility, amount outstanding     $ 0  
Utilized for letters of credit     37,000,000  
Borrowing base collateral     341,000,000  
Available borrowing capacity     $ 304,000,000  
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 February 2019 [Member]        
Debt Instrument [Line Items]        
Senior notes redeemed $ 15,000,000 $ 40,000,000    
Weighted average debt redemption price 103.25% 103.00%    
Loss on extinguishment of debt       $ 2,000,000