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Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Taxes [Abstract]    
Consolidated tax provision at federal statutory rate 21.00% 21.00%
State income tax provisions, net of federal income tax expense (benefit) 8.70% (1.20%)
Changes in certain deferred tax balances 60.90% 0.60%
Interest expense deduction (36.70%)  
Restructuring cost 5.10% (3.40%)
Loss on disposal of Northwest Operations   (2.40%)
Tax reserve adjustment   (2.50%)
Share-based payments   (0.70%)
Federal research and development credit   0.60%
All other, net 0.20% (0.90%)
Effective tax rate 59.20% 11.10%