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Debt - Revolving Credit Agreement (Details) - USD ($)
Sep. 30, 2016
Aug. 18, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Outstanding borrowing $ 0   $ 0
Revolving Credit Agreement      
Debt Instrument [Line Items]      
Current borrowing base 475,000,000 $ 525,000,000  
Borrowing base 475,000,000.00    
Outstanding borrowing 0   $ 0
Letters of credit outstanding, amount 300,000    
Revolving credit agreement, remaining borrowing capacity $ 474,700,000    
Revolving Credit Agreement | Weighted Average      
Debt Instrument [Line Items]      
Revolving credit agreement, weighted average interest rate 1.50%