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Derivatives - Schedule of Derivatives Fair Value Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Prepaid Expenses and Other Current Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral $ 6,000 $ 20,900
Other Noncurrent Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral   7,000
Commodity Contract | Prepaid Expenses and Other Current Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 0 4,577
Commodity Contract | Other Noncurrent Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 1,997 0
Commodity Contract | Other Accrued Liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (5,149) (9,534)
Commodity Contract | Other Liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (430) (4,925)
Interest Rate | Other Noncurrent Assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 151 0
Interest Rate | Other Accrued Liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (430) 0
Interest Rate | Other Liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (216) 0
Over the Counter | Embedded Derivative    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) $ (10,546) $ 9,810