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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)