Segment Information (Reportable Segments and Reconciliation of Adjusted Segment EBIT) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Presort Services
Segment Reporting Information [Line Items]
Adjusted segment EBIT	$ 32,626	$ 46,179	$ 123,345	$ 113,556
Operating Segments
Segment Reporting Information [Line Items]
Revenue	459,675	497,743	1,415,004	1,500,502
Adjusted segment EBIT	133,685	148,159	422,686	407,473
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Revenue	310,782	331,376	938,104	1,017,470
Cost of revenue	105,399	117,682	317,082	362,173
Operating expenses	104,324	111,714	321,681	361,380
Adjusted segment EBIT	101,059	101,980	299,341	293,917
Operating Segments | Presort Services
Segment Reporting Information [Line Items]
Revenue	148,893	166,367	476,900	483,032
Cost of revenue	98,492	102,670	299,279	310,797
Operating expenses	17,775	17,518	54,276	58,679
Adjusted segment EBIT	$ 32,626	$ 46,179	$ 123,345	$ 113,556