Acquisitions and Dispositions Acquisitions and Dispositions - Divestitures (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business			$ 27,677	$ 0	$ 0
Gain on sale of business			18,070	0	0
Income tax expense			$ 109,538	$ 113,054	$ 97,914
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