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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Commodity Swaps
Asset Derivative Instruments
Prepaid Expense	$ 144,771	$ 28,612
Other Assets	176,794	164,310
Total Asset	321,565	192,922
Liability Derivative Instruments
Other Accrued Liabilities	1,606	34,640
Other Liabilities	37,603	52,011
Total Liability	39,209	86,651
Basis Swap
Asset Derivative Instruments
Prepaid Expense	4,934	11,628
Other Assets	13,225	48,788
Total Asset	18,159	60,416
Liability Derivative Instruments
Other Accrued Liabilities	46,250	27,021
Other Liabilities	97,893	40,210
Total Liability	$ 144,143	$ 67,231

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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