Acquisitions, Intangible Assets and Goodwill (Goodwill) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Goodwill
Goodwill	$ 1,952,444
Acquisitions	2,684
Other	10,856
Goodwill	1,965,984
Commerce Services
Goodwill
Goodwill	807,242
Acquisitions	2,684
Other	(653)
Goodwill	809,273
Commerce Services \| Global Ecommerce
Goodwill
Goodwill	602,461
Acquisitions	0
Other	(653)
Goodwill	601,808
Commerce Services \| Presort Services
Goodwill
Goodwill	204,781
Acquisitions	2,684
Other	0
Goodwill	207,465
Small & Medium Business Solutions
Goodwill
Goodwill	527,108
Acquisitions	0
Other	6,922
Goodwill	534,030
Small & Medium Business Solutions \| North America Mailing
Goodwill
Goodwill	368,905
Acquisitions	0
Other	(205)
Goodwill	368,700
Small & Medium Business Solutions \| International Mailing
Goodwill
Goodwill	158,203
Acquisitions	0
Other	7,127
Goodwill	165,330
Software Solutions
Goodwill
Goodwill	510,605
Acquisitions	0
Other	2,924
Goodwill	513,529
Production Mail
Goodwill
Goodwill	107,489
Acquisitions	0
Other	1,663
Goodwill	$ 109,152

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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