Segment Information (Reportable Segments and Reconciliation of Adjusted Segment EBIT) (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]
Operating expenses	$ 325,798	$ 305,353	$ 258,333	$ 225,143	$ 330,385	$ 228,081	$ 278,200	$ 237,864	$ 1,114,627	$ 1,074,530
Adjusted segment EBIT									165,784	110,912	$ 82,430
Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,942,453	1,945,472	2,120,771
Adjusted segment EBIT									567,584	519,003	484,148
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Revenue									1,279,866	1,327,873	1,518,755
Cost of revenue									424,472	454,176	625,762
Operating expenses									453,594	465,606	491,275
Adjusted segment EBIT									401,800	408,091	401,718
Operating Segments | Presort Services
Segment Reporting Information [Line Items]
Revenue									662,587	617,599	602,016
Cost of revenue									417,741	432,229	454,923
Operating expenses									79,062	74,458	64,663
Adjusted segment EBIT									$ 165,784	$ 110,912	$ 82,430