Segment Information (Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Assets	$ 5,466,900	$ 5,938,419	$ 6,634,606
Cash and cash equivalents	924,442	867,262
Identifiable long-lived assets	417,402	444,729	416,640
United States
Segment Reporting Information [Line Items]
Identifiable long-lived assets	399,234	424,706	389,944
Outside United States
Segment Reporting Information [Line Items]
Identifiable long-lived assets	18,168	20,023	26,696
Commerce Services \| Global Ecommerce
Segment Reporting Information [Line Items]
Assets	1,102,313	1,023,732	1,016,045
Commerce Services \| Presort Services
Segment Reporting Information [Line Items]
Assets	524,817	431,512	387,701
Operating Segments
Segment Reporting Information [Line Items]
Assets	3,779,864	3,781,041	3,857,840
Operating Segments \| Commerce Services
Segment Reporting Information [Line Items]
Assets	1,627,130	1,455,244	1,403,746
Operating Segments \| SendTech Solutions
Segment Reporting Information [Line Items]
Assets	2,152,734	2,325,797	2,454,094
Reconciling Items
Segment Reporting Information [Line Items]
Cash and cash equivalents	924,442	867,262	1,009,021
Short-term investments	115,879	59,391	48,988
Assets of discontinued operations	17,229	602,823	923,012
Other corporate assets	$ 629,486	$ 627,902	$ 795,745

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