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Acquisitions and Divestitures (Additional Information - Divestitures) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income tax expense   $ 27,886 $ 28,913 $ 52,568 $ 55,842
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