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Intangible Assets, Goodwill and Other Assets (Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill
Beginning balance		$ 1,324,179		$ 1,324,179
Impairment	$ 0		$ 0	(198,169)	$ 0
Acquisition				8,463
Currency impact				7,671
Ending balance	1,142,144			1,142,144
Commerce Services
Goodwill
Beginning balance		821,960		821,960
Impairment				(198,169)
Acquisition				8,463
Currency impact				0
Ending balance	632,254			632,254
Commerce Services \| Global Ecommerce
Goodwill
Beginning balance		609,431		609,431
Impairment		(198,000)		(198,169)
Acquisition				0
Currency impact				0
Ending balance	411,262			411,262
Carrying value percentage						20.00%
Commerce Services \| Presort Services
Goodwill
Beginning balance		212,529		212,529
Impairment				0
Acquisition				8,463
Currency impact				0
Ending balance	220,992			220,992
SendTech Solutions
Goodwill
Beginning balance		$ 502,219		502,219
Impairment				0
Acquisition				0
Currency impact				7,671
Ending balance	$ 509,890			$ 509,890