Segment Information (Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 516,121	$ 499,463	$ 489,745	$ 521,269	$ 526,416	$ 503,033	$ 500,831	$ 548,645	$ 2,026,598	$ 2,078,925	$ 2,482,883
United States
Segment Reporting Information [Line Items]
Revenue									1,700,864	1,712,079	2,010,052
Outside United States
Segment Reporting Information [Line Items]
Revenue									325,734	366,846	472,831
Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,942,453	1,945,472	2,120,771
Other
Segment Reporting Information [Line Items]
Revenue									84,145	133,453	362,112
Revenue									84,145	133,453	362,112
SendTech Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,279,866	1,327,873	1,518,755
Revenue									1,279,866	1,327,873	1,518,755
Presort Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue									662,587	617,599	602,016
Revenue									$ 662,587	$ 617,599	$ 602,016