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Fair Value Measurements Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 216,847 $ 488,411
Property, Plant and Equipment, Net 4,364,694 4,950,280
Derivative Liability, Fair Value, Gross Liability 155,764 8
Net Profits Plan Liability Noncurrent 1,162 7,611
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net Profits Plan Liability Noncurrent 0 [1] 0 [2]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net Profits Plan Liability Noncurrent 0 [1] 0 [2]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net Profits Plan Liability Noncurrent 1,162 [1] 7,611 [2]
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant and Equipment, Net [3]   0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant and Equipment, Net [3]   0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property, Plant and Equipment, Net [3]   124,813
Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 [1] 0 [2]
Derivative Liability, Fair Value, Gross Liability 0 [1] 0 [2]
Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset 216,847 [1] 488,411 [2]
Derivative Liability, Fair Value, Gross Liability 155,764 [1] 8 [2]
Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 [1] 0 [2]
Derivative Liability, Fair Value, Gross Liability $ 0 [1] $ 0 [2]
[1] This represents a financial asset or liability that is measured at fair value on a recurring basis.
[2] This represents a financial asset or liability that is measured at fair value on a recurring basis.
[3] This represents a non-financial asset that is measured at fair value on a nonrecurring basis.