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INCOME TAXES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 21.00% 21.00% 21.00%
Federal net operating loss $ 1,337,050 $ 1,473,093  
State net operating loss and benefits 216,181 258,929  
Other tax expense from gains on investments 19,400    
Current Tax Expense (Benefit)      
Federal 2,897 980 $ (1,278)
State 9,544 1,797 963
Total current tax expense (benefit) 12,441 2,777 (315)
Deferred Tax Expense      
Federal 433,469 154,068 327,806
State 38,588 32,662 44,923
Total deferred tax expense 472,057 186,730 372,729
Income tax expense 484,498 189,507 372,414
Income Tax Reconciliation      
Income before income taxes $ 1,984,204 $ 802,316 $ 1,650,991
Federal statutory income tax rate 21.00% 21.00% 21.00%
Provision for federal income taxes $ 416,683 $ 168,486 $ 346,708
State income taxes, net of federal benefit 40,092 13,580 34,545
Deferred tax rate change, inclusive of valuation allowance 6,350 20,879 11,340
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, amount (1,968) (7,380) (20,983)
Other, net 23,341 (6,058) 804
Deferred Tax Assets      
Employee benefits and other accrued liabilities 95,952 96,741  
Federal net operating loss 1,337,050 1,473,093  
State net operating loss and benefits 216,181 258,929  
Derivative instruments 118,063 134,499  
Other 4,863 12,894  
Total deferred tax assets 1,772,109 1,976,156  
Carryforward expected to expire prior to utilization (84,755) (121,212)  
Net deferred tax assets 1,687,354 1,854,944  
Deferred Tax Liabilities      
Excess of tax over book depreciation 84,692 87,021  
Deferred tax liabilities, investments 2,769,352 2,437,620  
Total deferred tax liabilities 2,854,044 2,524,641  
Deferred Tax Liabilities, Net (1,166,690) (669,697)  
Valuation allowance, deferred tax asset, increase (decrease), amount 6,400 20,900 $ 11,300
Domestic Tax Authority      
Operating loss carryforwards 6,400,000    
State and Local Jurisdiction | Operating Loss Carryforwards, Subject to Expiration [Domain]      
Operating loss carryforwards 1,900,000    
State and Local Jurisdiction | Operating Loss Carryforwards, Indefinite Carryforward Period [Domain]      
Operating loss carryforwards 2,800,000    
Federal and State [Member]      
Federal net operating loss 1,600,000 1,700,000  
Deferred Tax Assets      
Federal net operating loss $ 1,600,000 $ 1,700,000