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Derivative Financial Instruments Fair Value (Details) - USD ($)
$ in Thousands

Mar. 31, 2017

Dec. 31, 2016

Fair value of derivative assets and liabilities

Derivative, Fair Value, Net

$ 23,058

$ (91,708)

Derivative asset current

73,978

54,521

Derivative asset noncurrent

84,195

67,575

Derivative Asset, Fair Value, Gross Asset

158,173

122,096

Derivative liability

53,809

115,464

Derivatives liability noncurrent

81,306

98,340

Derivative Liability, Fair Value, Gross Liability

135,115

213,804

Derivatives not designated as hedging instruments

Fair value of derivative assets and liabilities

Derivative asset current

73,978

54,521

Derivative asset noncurrent

84,195

67,575

Derivative liability

53,809

115,464

Derivatives liability noncurrent

81,306

98,340

Fair Value, Inputs, Level 2 [Member] | Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member]

Fair value of derivative assets and liabilities

Derivative Asset, Fair Value, Gross Asset

158,173

^[1]

122,096

^[2]

Derivative Liability, Fair Value, Gross Liability

$ 135,115

^[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.

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