Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Minimum
Concentration Risk [Line Items]
Amortization period			3 years
Maximum
Concentration Risk [Line Items]
Amortization period			20 years
Sales revenue | Professional Services, General Contracting Services, And Storage Services | Maximum
Concentration Risk [Line Items]
Concentration percentage	1.00%	1.00%	1.00%	1.00%
Freight Expenses As Selling, General And Administrative Expenses | Outgoing Freight Expenses | Professional Services, General Contracting Services, And Storage Services
Concentration Risk [Line Items]
Concentration percentage			95.00%
Inventories Using LIFO Method | Professional Services, General Contracting Services, And Storage Services | Finished Goods [Member]
Concentration Risk [Line Items]
Concentration percentage			87.00%	90.00%