Discontinued Operations (Financial Information) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Aug. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax		$ (8,470)	$ 32,621	$ (14,199)	$ 59,289
Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		73,620	95,300	219,144	454,738
Earnings (loss) from discontinued operations		8,633	3,217	12,671	48,801
(Loss) gain on sale (including transaction costs)	$ 18,000	(18,157)	86,640	(29,178)	77,863
(Loss) income from discontinued operations before taxes		(9,524)	89,857	(16,507)	126,664
Tax (benefit) provision		(1,054)	57,236	(2,308)	67,375
(Loss) income from discontinued operations, net of tax		(8,470)	32,621	(14,199)	59,289
Software Solutions | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of business						$ 700,000
Revenue		73,620	75,743	219,144	243,738
Earnings (loss) from discontinued operations		8,633	4,533	13,334	28,497
(Loss) gain on sale (including transaction costs)		(12,447)	0	(14,211)	0
(Loss) income from discontinued operations before taxes		(3,814)	4,533	(877)	28,497
Production Mail | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		0	19,557	0	211,000
Earnings (loss) from discontinued operations		0	(1,316)	(663)	20,304
(Loss) gain on sale (including transaction costs)		(5,710)	86,640	(14,967)	77,863
(Loss) income from discontinued operations before taxes		$ (5,710)	$ 85,324	$ (15,630)	$ 98,167