Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes [Abstract]
Consolidated tax provision at federal statutory rate (in hundredths)	21.00%	21.00%	21.00%	21.00%
State income tax provisions, net of federal income tax benefit (in hundredths)	11.30%	1.50%	5.40%	1.50%
Changes in certain deferred tax balances (in hundredths)	(7.80%)	(1.50%)	(3.90%)	(1.90%)
Interest expense deduction (in hundredths)	19.50%		10.40%
Restructuring cost	(6.40%)		(5.00%)
Goodwill impairment (in hundredths)		(10.40%)		(10.40%)
Loss on disposal of Northwest Operations (in hundredths)	(13.00%)	(1.40%)	(8.00%)	(1.40%)
Tax reserve adjustment (in hundredths)	0.80%		(0.70%)
Shared-based payments (in hundredths)			(0.30%)	(0.10%)
Federal research and development tax credit (in hundredths)	(1.50%)		(0.50%)
All other, net (in hundredths)		(0.10%)	(0.50%)
Effective tax rate (in hundredths)	23.90%	9.10%	17.90%	8.70%