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Income Taxes - Summary of Source and Tax Effects of Temporary Differences between Financial Reporting and Tax Bases of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
NOL carryforwards | $ 740,802 | $ 580,188
Net unrealized losses | 0 | 171,697
Federal and state capital loss carryforward | 99,632 | 99,837
Federal tax credits | 92,730 | 88,015
Alternative minimum tax carryforward | 0 | 81,237
Interest disallowance limitation | 59,668 | 304
Other | 1,156 | 5,697
Incentive compensation and deferred compensation plans | 16,854 | 14,586
Deferred tax assets | 1,010,842 | 1,041,561
Valuation allowance | (290,812) | (365,140)
Net deferred tax asset | 720,030 | 676,421
Deferred tax liabilities: |  |
Property, plant and equipment | (2,457,946) | (2,118,827)
Net unrealized losses | (166,905) | 0
Deferred tax liabilities | (2,624,851) | (2,118,827)
Net deferred tax liability | $ (1,904,821) | $ (1,442,406)

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