Acquisitions, Intangible Assets and Goodwill (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Balance at	$ 1,332,351	$ 1,334,350
Acquisitions/ dispositions	(5,426)	10,307
Other	(2,746)	(12,306)
Balance at	1,324,179	1,332,351
Commerce Services
Goodwill
Balance at	816,896	807,242
Acquisitions/ dispositions	5,064	10,307
Other	0	(653)
Balance at	821,960	816,896
Commerce Services | Global Ecommerce
Goodwill
Balance at	609,431	602,461
Acquisitions/ dispositions	0	7,623
Other	0	(653)
Balance at	609,431	609,431
Commerce Services | Presort Services
Goodwill
Balance at	207,465	204,781
Acquisitions/ dispositions	5,064	2,684
Other	0	0
Balance at	212,529	207,465
SendTech Solutions
Goodwill
Balance at	515,455	527,108
Acquisitions/ dispositions	(10,490)	0
Other	(2,746)	(11,653)
Balance at	$ 502,219	$ 515,455