Segment Information (Depreciation and Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 159,142	$ 148,464	$ 126,790
Digital Commerce Solutions | Global Ecommerce
Segment Reporting Information [Line Items]
Depreciation and amortization	68,385	61,046	36,786
Digital Commerce Solutions | Presort Services
Segment Reporting Information [Line Items]
Depreciation and amortization	29,440	26,838	26,541
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	21,559	21,476	24,104
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	137,583	126,988	102,686
Operating Segments | Digital Commerce Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization	97,825	87,884	63,327
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 39,758	$ 39,104	$ 39,359