Property And Depreciation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation	$ 36,200,000	$ 36,700,000	$ 36,100,000
Net book value of sold assets held for sale	400,000	4,400,000	$ 0
Gain on sale of assets held for sale	9,100,000	3,400,000
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Net book value of assets held for sale	$ 0	$ 0