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Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]        
Consolidated tax provision at federal statutory rate 21.00% 21.00% 21.00% 21.00%
State income tax expense, net of federal income tax benefit 0.50% 3.10% 4.80% 21.70%
Changes in certain deferred tax balances   (8.20%) (0.50%) (35.80%)
Interest expense deduction       30.70%
Restructuring cost 0.30%     (10.00%)
Tax reserve adjustment   0.10% 0.60% (0.70%)
Fresh start and reorganization adjustments (24.90%)      
Loss on disposal of Northwest Operations       (9.10%)
Shared-based payments       (0.20%)
Federal research and development tax credit   (0.40%) (1.20%) (0.50%)
All other, net   1.60% 1.70% 0.10%
Effective tax rate (3.10%) 17.20% 26.40% 17.20%