Business Acquisitions - Narrative (Details) - USD ($) $ in Thousands			6 Months Ended
	Apr. 06, 2015	Feb. 27, 2015	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill			$ 1,135,947	$ 1,051,294
Xerocole, Codemate A/S and Octoshape [Member]
Business Acquisition [Line Items]
Acquisition-related costs			800
Xerocole, Inc. [Member]
Business Acquisition [Line Items]
Total purchase consideration		$ 16,600
Goodwill		12,900
Intangible assets acquired		$ 4,900
Weighted average useful life		8 years 9 months
Octoshape [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 107,547
Goodwill	$ 69,945
Intangible assets acquired			41,950
Goodwill expected to be tax deductible			$ 69,900