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Income Taxes - Components of net deferred taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 4,004,602 | $ 3,878,344
Tax credit and other attribute carryforwards | 86,896 | 84,812
Accrued interest | 19,311 | 13,302
Property, plant and equipment |  | 20,431
Other | 106,520 | 100,316
Subtotal | 4,217,329 | 4,097,205
Valuation allowance | (3,962,200) | (3,839,885)
Deferred tax assets | 255,129 | 257,320
Deferred tax liabilities: |  |
Property, plant and equipment | 15,181 |
Other | 2,443 | 2,858
Deferred tax liability | 17,624 | 2,858
Net deferred tax assets (liabilities) | 237,505 | 254,462
Balance Sheet Summary : |  |
Net noncurrent deferred tax asset | 238,871 | 257,320
Net noncurrent deferred tax liability | (1,366) | (2,858)
Net deferred tax assets (liabilities) | $ 237,505 | $ 254,462

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