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Derivatives - Fair Values (Gross and Net) of Outstanding Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Liabilities:
Total derivatives	$ (52,144)	$ (20,814)
Commodity Contracts | Current assets
Assets:
Gross Amounts Recognized at Fair Value	30,356	15,217
Gross Amounts Offset in the Balance Sheet	(29,472)	(12,710)
Net Fair Value Presented  in the Balance Sheet	884	2,507
Commodity Contracts | Non-current assets
Assets:
Gross Amounts Recognized at Fair Value	36,287
Gross Amounts Offset in the Balance Sheet	(34,245)
Net Fair Value Presented  in the Balance Sheet	2,042
Commodity Contracts | Current liabilities
Liabilities:
Gross Amounts Recognized at Fair Value	(68,939)	(36,031)
Gross Amounts Offset in the Balance Sheet	29,472	12,710
Net Fair Value Presented  in the Balance Sheet	(39,467)	$ (23,321)
Commodity Contracts | Non-current liabilities
Liabilities:
Gross Amounts Recognized at Fair Value	(49,848)
Gross Amounts Offset in the Balance Sheet	34,245
Net Fair Value Presented  in the Balance Sheet	$ (15,603)

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