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Derivative Financial Instruments Fair Value (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016
--- | --- | --- | ---
Fair value of derivative assets and liabilities |  |  |  |  |
Derivative, Fair Value, Net | $ 158,300 |  | $ (139,400) |  |
Derivative Assets, Current | 175,130 |  | 64,266 |  |
Derivative Assets, Noncurrent | 58,499 |  | 40,362 |  |
Total Derivative Assets | 233,629 |  | 104,628 |  |
Derivative Liabilities, Current | 62,853 |  | 172,582 |  |
Derivative Liabilities, Noncurrent | 12,496 |  | 71,402 |  |
Total Derivative Liabilities | (75,349) |  | (243,984) |  |
Derivative Asset, Not Offset in the Accompanying Balance Sheets | (56,041) |  | (100,035) |  |
Derivative Liabilities, Not Offset in the Accompanying Balance Sheets | 56,041 |  | 100,035 |  |
Derivative Asset, Fair Value, Net Amounts | 177,588 |  | 4,593 |  |
Derivative Liability, Fair Value, Net Amounts | 19,308 |  | 143,949 |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |  |
Derivative Assets, Current | 175,130 |  | 64,266 |  |
Derivative Assets, Noncurrent | 58,499 |  | 40,362 |  |
Derivative Liabilities, Current | 62,853 |  | 172,582 |  |
Derivative Liabilities, Noncurrent | 12,496 |  | 71,402 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Fair value of derivative assets and liabilities |  |  |  |  |
Total Derivative Assets | 233,629 | [1] | 104,628 | [2] |
Total Derivative Liabilities | $ (75,349) | [1] | $ (243,984) | [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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