CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Sales
Net sales	$ 595,393	$ 567,901	$ 1,763,213	$ 1,659,145
Total net sales	595,393	567,901	1,763,213	1,659,145
Cost of sales
Total cost of sales	372,875	360,405	1,133,004	1,089,704
Gross profit	222,518	207,496	630,209	569,441
Research and development expenses	14,239	14,826	45,234	46,205
Selling expenses	30,361	29,252	94,546	87,765
General and administrative expenses	80,871	71,004	226,808	215,633
Operating income	97,047	92,414	263,621	219,838
Interest expense	(7,949)	(10,457)	(25,719)	(31,584)
Other income, net	3,843	4,457	12,497	12,033
Earnings from continuing operations before income taxes	92,941	86,414	250,399	200,287
Provision for income taxes	(18,458)	(22,470)	(57,485)	(53,146)
Net earnings	$ 74,483	$ 63,944	$ 192,914	$ 147,141
Basic earnings per share
Basic earnings per share (usd per share)	$ 1.70	$ 1.45	$ 4.38	$ 3.33
Diluted earnings per share
Diluted earnings per share (usd per share)	1.68	1.43	4.33	3.29
Dividends per share	$ 0.15	$ 0.15	$ 0.45	$ 0.41
Weighted average shares outstanding:
Basic (shares)	43,892	44,137	44,060	44,196
Diluted (shares)	44,334	44,686	44,513	44,782
Product [Member]
Net Sales
Net sales	$ 495,197	$ 468,073	$ 1,451,560	$ 1,351,076
Cost of sales
Cost of Goods and Services Sold	312,702	294,907	936,197	887,311
Service [Member]
Net Sales
Net sales	100,196	99,828	311,653	308,069
Cost of sales
Cost of Goods and Services Sold	$ 60,173	$ 65,498	$ 196,807	$ 202,393