Acquisitions - Schedules (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2018	Jul. 23, 2018	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 955,524	$ 690,223			$ 633,436
Gimatic and IGS [Member]
Business Acquisition [Line Items]
Net Sales	1,555,481	1,501,515
Net Income	$ 171,422	$ 44,029
Basic net income (in dollars per share)	$ 3.28	$ 0.81
Diluted net income (in dollars per share)	$ 3.24	$ 0.81
IGS
Business Acquisition [Line Items]
Accounts receivable				$ 3,300
Inventories				5,706
Prepaid expenses and other current assets				198
Deferred income taxes				0
Property, plant and equipment, net				1,557
Goodwill				14,098
Other intangible assets, net				15,300
Other assets				0
Total assets acquired				40,159
Accounts payable				(927)
Accrued liabilities				(603)
Debt assumed				0
Other liabilities				(678)
Deferred income taxes				(3,614)
Total liabilities assumed				(5,822)
Net assets acquired				$ 34,337
Gimatic
Business Acquisition [Line Items]
Accounts receivable			$ 11,552
Inventories			21,112
Prepaid expenses and other current assets			7,743
Deferred income taxes			917
Property, plant and equipment, net			7,167
Goodwill			271,257
Other intangible assets, net			158,800
Other assets			144
Total assets acquired			478,692
Accounts payable			(3,825)
Accrued liabilities			(14,096)
Debt assumed			(5,990)
Other liabilities			(7,126)
Deferred income taxes			(46,574)
Total liabilities assumed			(77,611)
Net assets acquired			$ 401,081