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Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Consolidated tax provision at federal statutory rate 21.00% 21.00% 35.00%
State income tax provisions, net of federal income tax benefit 2.60% 1.60% 1.70%
Tax reserve adjustment   0.10% 0.10%
Changes in certain deferred tax balances (2.30%) (3.50%) (0.40%)
Goodwill impairment (11.80%) (10.40%) (19.10%)
Share-based payments (0.10%) (0.50%)  
Federal research and development credit   0.10% 0.10%
Deferred Tax Remeasurement - 2017 Tax Reform   0.60% 26.10%
All other, net   (0.20%) (0.10%)
Effective tax rate 9.40% 8.80% 43.40%