Segment Information (Reportable Segments and Reconciliation of Adjusted Segment EBIT) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Presort Services
Segment Reporting Information [Line Items]
Adjusted segment EBIT	$ 35,940	$ 27,048	$ 90,719	$ 67,377
Operating Segments
Segment Reporting Information [Line Items]
Revenue	461,909	486,131	955,329	1,002,759
Adjusted segment EBIT	137,195	123,071	289,001	259,314
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Revenue	311,716	339,273	627,322	686,094
Cost of revenue	105,653	120,647	211,683	244,491
Operating expenses	104,808	122,603	217,357	249,666
Adjusted segment EBIT	101,255	96,023	198,282	191,937
Operating Segments | Presort Services
Segment Reporting Information [Line Items]
Revenue	150,193	146,858	328,007	316,665
Cost of revenue	96,153	100,800	200,787	208,127
Operating expenses	18,100	19,010	36,501	41,161
Adjusted segment EBIT	$ 35,940	$ 27,048	$ 90,719	$ 67,377