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Revenue from Contracts with Customers (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ (5,235,874)			$ (5,229,584)
Software	81,616	$ 77,867
Income before income taxes	73,092	$ 96,549
Amortization expense	4,000
Unamortized contract costs	26,000
Revenue recognized	$ 107,000
Production Mail
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract period	12 months
ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ (5,235,874)		$ 9,000
Software	81,616
Income before income taxes	73,092
ASC 606 \| Total increase (decrease)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	816
Software	11,019
Income before income taxes	10,388
ASC 606 \| License And Maintenance \| Total increase (decrease)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Software	11,000
Income before income taxes	$ 9,000