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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax liabilities    
Investments $ 0 $ 0
Derivative contracts 0 0
Total deferred tax liabilities 0 0
Deferred tax assets    
Property, plant and equipment 89,090 181,037
Net operating loss carryforwards 373,702 440,332
Tax credits and other carryforwards 33,852 33,861
Asset retirement obligations 13,791 14,842
Investments 165 106
Other 1,392 2,363
Total deferred tax assets 511,992 672,541
Valuation allowance (447,463) (672,541)
Net deferred tax asset $ 64,529 $ 0