Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Increase in the allowance for credit losses on accounts receivable	$ 5,344,000	$ 11,168,000
Allowance for credit losses	21,950,000	26,218,000	$ 35,869,000		$ 19,651,000
Reduction to retained earnings	5,125,677,000	5,169,270,000
Income (loss) from continuing operations before income taxes	39,880,000	(7,415,000)	(183,369,000)
Marketable securities, unrealized gain (loss)	$ 0	0	0
Revenue recognition discontinuation period (more than)	90 days
Revenue recognition resume period (less than)	60 days
Finite-lived intangible assets, estimated useful lives	10 years
Amortization expense	$ 22,000,000	18,000,000	10,000,000
Recognition period	5 years
Impairment	$ 0	0	$ 198,169,000
Other assets
Property, Plant and Equipment [Line Items]
Unamortized contract costs	$ 41,000,000	$ 48,000,000
Minimum
Property, Plant and Equipment [Line Items]
Lease period	3 years
Maximum
Property, Plant and Equipment [Line Items]
Lease period	5 years
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	50 years
Building improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Building improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Software development costs | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	12 years
Rental equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Rental equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	6 years
Global Ecommerce
Property, Plant and Equipment [Line Items]
Increase (decrease) in transportation costs	$ 10,000,000
Presort Services
Property, Plant and Equipment [Line Items]
Increase (decrease) in transportation costs	(10,000,000)
Revision of prior period, error correction, adjustment
Property, Plant and Equipment [Line Items]
Income (loss) from continuing operations before income taxes	$ 3,000,000
Cumulative effect of accounting change
Property, Plant and Equipment [Line Items]
Increase in the allowance for credit losses on accounts receivable				$ 15,000,000
Allowance for credit losses				10,000,000	$ 9,503,000
Reduction to retained earnings				$ (22,000,000)