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Derivative Financial Instruments Fair Value (Details) $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
--- | --- | --- | ---
Fair value of derivative assets and liabilities |  |  |  |  |
Derivative, Fair Value, Net | $ 21,500 |  | $ 158,300 |  |
Derivative Assets, Current | 55,184 |  | 175,130 |  |
Derivative Assets, Noncurrent | 20,624 |  | 58,499 |  |
Total Derivative Assets | 75,808 |  | 233,629 |  |
Derivative Liabilities, Current | 50,846 |  | 62,853 |  |
Derivative Liabilities, Noncurrent | 3,444 |  | 12,496 |  |
Total Derivative Liabilities | (54,290) |  | (75,349) |  |
Derivative Asset, Not Offset in the Accompanying Balance Sheets | (35,075) |  | (56,041) |  |
Derivative Liabilities, Not Offset in the Accompanying Balance Sheets | 35,075 |  | 56,041 |  |
Derivative Asset, Fair Value, Net Amounts | 40,733 |  | 177,588 |  |
Derivative Liability, Fair Value, Net Amounts | (19,215) |  | (19,308) |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |  |
Derivative Assets, Current | 55,184 |  | 175,130 |  |
Derivative Assets, Noncurrent | 20,624 |  | 58,499 |  |
Derivative Liabilities, Current | 50,846 |  | 62,853 |  |
Derivative Liabilities, Noncurrent | 3,444 |  | 12,496 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |  |
Total Derivative Assets | 75,808 | [1] | 233,629 | [2] |
Total Derivative Liabilities | $ 54,290 | [1] | $ 75,349 | [2] |
Designated as Hedging Instrument [Member] |  |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |  |
Derivative, Number of Instruments Held | 0 |  | 0 |  | 0
[1] | (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.
[2] | (1) This represents a financial asset or liability that is measured at fair value on a recurring basis.

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