Goodwill And Other Intangible Assets (Schedule Of Finite Lived Intangible Assets) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,400,000	$ 31,900,000
Accumulated Amortization	(9,900,000)	(7,400,000)
Total Net Carrying Amount	21,500,000	24,500,000
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,700,000	17,100,000
Accumulated Amortization	(6,700,000)	(5,000,000.0)
Total Net Carrying Amount	10,000,000.0	$ 12,100,000
Incurred loss	$ 500,000
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	8 years 6 months	8 years 6 months
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	10 years 9 months 18 days	10 years 9 months 18 days
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 14,300,000	$ 14,300,000
Accumulated Amortization	(2,800,000)	(2,100,000)
Total Net Carrying Amount	$ 11,500,000	$ 12,200,000
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	15 years	15 years
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	20 years	20 years
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 300,000	$ 300,000
Accumulated Amortization	$ (300,000)	(200,000)
Total Net Carrying Amount		$ 100,000
Noncompete Agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	3 years	3 years
Noncompete Agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	5 years	5 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100,000	$ 200,000
Accumulated Amortization	$ (100,000)	(100,000)
Total Net Carrying Amount		100,000
Weighted-average useful lives (in years)	10 years
Incurred loss		0
Amortization expense	$ 2,500,000	$ 2,600,000	$ 2,600,000