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Derivative Financial Instruments Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value of derivative assets and liabilities |  |  |  |
Price Risk Derivatives, at Fair Value, Net | $ 489,900 |  | $ 592,100 |
Derivative asset current | 347,299 |  | 402,668 |
Derivative asset noncurrent | 147,530 |  | 189,540 |
Derivative Asset, Fair Value, Gross Asset | 494,829 |  | 592,208 |
Derivative liability | 2,900 |  | 0 |
Derivatives liability noncurrent | 2,019 |  | 70 |
Derivative Liability, Fair Value, Gross Liability | 4,919 |  | 70 |
Derivatives not designated as hedging instruments |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |
Derivative asset current | 347,299 |  | 402,668 |
Derivative asset noncurrent | 147,530 |  | 189,540 |
Derivative liability | 2,900 |  | 0 |
Derivatives liability noncurrent | 2,019 |  | 70 |
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 | 494,829 | [1] | 592,208 | [2]
Derivative Liability, Fair Value, Gross Liability | $ 4,919 | [1] | $ 70 | [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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