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Fair Value Measurements Fair Value (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 158,173,000 $ 122,096,000
Property, Plant and Equipment, Net 5,450,120,000 6,081,354,000
Derivative Liability, Fair Value, Gross Liability 135,115,000 213,804,000
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 0 [1] 0 [2]
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 0 [1] 0 [2]
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 443,772,000 [1] 88,205,000 [2]
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 [3] 0 [4]
Derivative Liability, Fair Value, Gross Liability 0 [3] 0 [4]
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 158,173,000 [3] 122,096,000 [4]
Derivative Liability, Fair Value, Gross Liability 135,115,000 [3] 213,804,000 [4]
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 [3] 0 [4]
Derivative Liability, Fair Value, Gross Liability $ 0 [3] $ 0 [4]
[1] This represents a non-financial asset that is measured at fair value on a nonrecurring basis.
[2] This represents a non-financial asset that is measured at fair value on a nonrecurring basis.
[3] This represents a financial asset or liability that is measured at fair value on a recurring basis.
[4] This represents a financial asset or liability that is measured at fair value on a recurring basis.