CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net sales
Product sales	$ 468,073	$ 413,905	$ 1,351,076	$ 1,244,148
Service sales	99,828	93,187	308,069	299,218
Total net sales	567,901	507,092	1,659,145	1,543,366
Cost of sales
Cost of product sales	292,215	261,488	878,446	806,092
Cost of service sales	64,903	61,128	200,371	195,515
Total cost of sales	357,118	322,616	1,078,817	1,001,607
Gross profit	210,783	184,476	580,328	541,759
Research and development expenses	14,575	14,071	45,374	44,467
Selling expenses	28,818	26,273	86,331	85,025
General and administrative expenses	70,840	67,559	217,575	210,342
Operating income	96,550	76,573	231,048	201,925
Interest expense	(10,457)	(10,488)	(31,584)	(30,694)
Other income, net	321	483	823	818
Earnings from continuing operations before income taxes	86,414	66,568	200,287	172,049
Provision for income taxes	(22,470)	(20,636)	(53,146)	(53,335)
Net earnings	$ 63,944	$ 45,932	$ 147,141	$ 118,714
Basic earnings per share
Basic earnings per share (usd per share)	$ 1.45	$ 1.04	$ 3.33	$ 2.67
Diluted earnings per share
Diluted earnings per share (usd per share)	1.43	1.02	3.29	2.63
Dividends per share	$ 0.15	$ 0.13	$ 0.41	$ 0.39
Weighted average shares outstanding:
Basic (shares)	44,137	44,323	44,196	44,457
Diluted (shares)	44,686	44,997	44,782	45,128