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Derivative Instruments Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Commodity Swaps [Member] |  |
Asset Derivative Instruments |  |
Prepaid Expense | $ 27,226 | $ 62,369
Other Assets | 132,594 | 59,281
Total Asset | 159,820 | 121,650
Liability Derivative Instruments |  |
Other Accrued Liabilities | 26,943 | 5,985
Other Liabilities | 10,381 | 42,419
Total Liability | 37,324 | 48,404
Basis Swap [Member] |  |
Asset Derivative Instruments |  |
Prepaid Expense | 10,932 | 14,965
Other Assets | 35,101 | 24,223
Total Asset | 46,033 | 39,188
Liability Derivative Instruments |  |
Other Accrued Liabilities | 26,969 | 35,306
Other Liabilities | 20,557 | 17,179
Total Liability | $ 47,526 | $ 52,485

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