Segment Information (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 4,741,355	$ 4,958,871	$ 5,224,363
Cash and cash equivalents	669,981	732,480
Short-term investments	11,172	14,440
Long-term investments	259,977	333,052
Identifiable long-lived assets	744,288	672,364	631,631
United States
Segment Reporting Information [Line Items]
Identifiable long-lived assets	730,347	658,070	613,990
Outside United States
Segment Reporting Information [Line Items]
Identifiable long-lived assets	13,941	14,294	17,641
Digital Commerce Solutions | Global Ecommerce
Segment Reporting Information [Line Items]
Assets	996,297	1,032,434	994,554
Digital Commerce Solutions | Presort Services
Segment Reporting Information [Line Items]
Assets	510,345	479,392	523,690
Operating Segments
Segment Reporting Information [Line Items]
Assets	3,529,662	3,525,187	3,589,272
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Assets	2,023,020	2,013,361	2,071,028
Reconciling Items
Segment Reporting Information [Line Items]
Cash and cash equivalents	669,981	732,480	921,450
Short-term investments	11,172	14,440	18,974
Long-term investments	259,977	333,052	364,212
Other corporate assets	$ 270,563	$ 353,712	$ 330,455