Acquisitions and Dispositions (Additional Information - Dispositions) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business				$ 27,677	$ 0
Gain on sale of business		$ 18,070	$ 0	18,070	0
Income tax expense		32,772	$ 29,889	$ 88,614	$ 89,332
Ismatec Product Line
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 27,700
Gain on sale of business	$ 18,100
Income tax expense		$ 4,800