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Derivative Financial Instruments Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Fair value of derivative assets and liabilities |  |  |  |
Derivative, Fair Value, Net | $ 61,900 |  | $ (91,700) |
Derivative asset current | 85,962 |  | 54,521 |
Derivative asset noncurrent | 82,194 |  | 67,575 |
Derivative Asset, Fair Value, Gross Asset | 168,156 |  | 122,096 |
Derivative liability current | 36,296 |  | 115,464 |
Derivatives liability noncurrent | 69,915 |  | 98,340 |
Derivative Liability, Fair Value, Gross Liability | 106,211 |  | 213,804 |
Derivatives not designated as hedging instruments |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |
Derivative asset current | 85,962 |  | 54,521 |
Derivative asset noncurrent | 82,194 |  | 67,575 |
Derivative liability current | 36,296 |  | 115,464 |
Derivatives liability noncurrent | 69,915 |  | 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 | 168,156 | [1] | 122,096 | [2]
Derivative Liability, Fair Value, Gross Liability | $ 106,211 | [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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