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Derivative Financial Instruments Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair value of derivative assets and liabilities    
Derivative, Fair Value, Net $ 139,400 $ 91,700
Derivative Assets, Current 64,266 54,521
Derivative Liabilities, Current 172,582 115,464
Derivative Assets, Noncurrent 40,362 67,575
Derivative Liabilities, Noncurrent 71,402 98,340
Derivative Asset, Fair Value, Gross Asset 104,628 122,096
Derivative Liability, Fair Value, Gross Liability 243,984 213,804
Derivative Asset, Not Offset in the Accompanying Balance Sheets (100,035) (118,080)
Derivative Liability, Not Offset in the Accompanying Balance Sheets 100,035 118,080
Derivative Asset, Fair Value, Net Amounts 4,593 4,016
Derivative Liability, Fair Value, Net Amounts (143,949) (95,724)
Not Designated as Hedging Instrument [Member]    
Fair value of derivative assets and liabilities    
Derivative Assets, Current 64,266 54,521
Derivative Liabilities, Current 172,582 115,464
Derivative Assets, Noncurrent 40,362 67,575
Derivative Liabilities, Noncurrent 71,402 98,340
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]    
Fair value of derivative assets and liabilities    
Derivative Asset, Fair Value, Gross Asset 104,628 [1] 122,096 [2]
Derivative Liability, Fair Value, Gross Liability $ 243,984 [1] $ 213,804 [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.