Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment reporting information profit (loss)
Revenue	$ 983,182	$ 836,640
Reconciling items:
Interest, net	(30,853)	(25,676)
Restructuring charges, net	(1,021)	(2,082)
Income before income taxes	73,092	96,549
Provision for income taxes	19,579	31,416
Net income	53,513	65,133
Operating Segments
Segment reporting information profit (loss)
EBIT	169,146	192,437
Segment Reconciling Items
Reconciling items:
Interest, net	(43,078)	(38,650)
Unallocated corporate expenses	(49,361)	(55,156)
Restructuring charges, net	(1,021)	(2,082)
Transaction costs	(2,594)	0
Commerce Services
Segment reporting information profit (loss)
Revenue	381,048	220,829
Commerce Services \| Operating Segments
Segment reporting information profit (loss)
EBIT	19,315	26,447
Commerce Services \| Global Ecommerce
Segment reporting information profit (loss)
Revenue	246,590	88,152
EBIT	(7,711)	(4,270)
Commerce Services \| Presort Services
Segment reporting information profit (loss)
Revenue	134,458	132,677
EBIT	27,026	30,717
Small & Medium Business Solutions
Segment reporting information profit (loss)
Revenue	423,327	448,636
Small & Medium Business Solutions \| Operating Segments
Segment reporting information profit (loss)
EBIT	135,363	154,277
Small & Medium Business Solutions \| North America Mailing
Segment reporting information profit (loss)
Revenue	325,430	355,578
EBIT	119,471	141,008
Small & Medium Business Solutions \| International Mailing
Segment reporting information profit (loss)
Revenue	97,897	93,058
EBIT	15,892	13,269
Software Solutions
Segment reporting information profit (loss)
Revenue	81,616	78,220
Software Solutions \| Operating Segments
Segment reporting information profit (loss)
EBIT	4,849	2,749
Production Mail
Segment reporting information profit (loss)
Revenue	97,191	88,955
Production Mail \| Operating Segments
Segment reporting information profit (loss)
EBIT	$ 9,619	$ 8,964

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