Segment Information (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 3,397,516	$ 4,272,185	$ 4,741,355
Cash and cash equivalents	469,726	600,054	668,331
Short-term investments	16,374	22,166	11,172
Long-term investments	190,436	250,240	259,977
Other corporate assets	261,201	285,328	535,832
Assets of discontinued operations	0	532,441	693,023
Identifiable long-lived assets	356,600	404,153	442,914
United States
Segment Reporting Information [Line Items]
Identifiable long-lived assets	345,457	390,471	428,980
Outside United States
Segment Reporting Information [Line Items]
Identifiable long-lived assets	11,143	13,682	13,934
Operating Segments
Segment Reporting Information [Line Items]
Total assets	2,459,779	2,581,956	2,573,020
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Total assets	1,981,359	2,081,199	2,062,675
Operating Segments | Presort Services
Segment Reporting Information [Line Items]
Total assets	$ 478,420	$ 500,757	$ 510,345