Intangible Assets and Goodwill (Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Goodwill
Gross value before accumulated impairment		$ 1,350,454
Accumulated impairment	$ 0	(198,169)
Beginning balance	1,152,285
Currency impact	(8,221)
Ending balance	1,144,064
Digital Commerce Solutions \| Global Ecommerce
Goodwill
Gross value before accumulated impairment		609,431
Accumulated impairment		(198,169)
Beginning balance	411,262
Currency impact	0
Ending balance	411,262
Digital Commerce Solutions \| Presort Services
Goodwill
Gross value before accumulated impairment		220,992
Accumulated impairment		0
Beginning balance	220,992
Currency impact	0
Ending balance	220,992
SendTech Solutions
Goodwill
Gross value before accumulated impairment		520,031
Accumulated impairment		$ 0
Beginning balance	520,031
Currency impact	(8,221)
Ending balance	$ 511,810

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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