CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales
Product sales	$ 511,676	$ 459,774	$ 956,363	$ 883,003
Service sales	108,622	107,879	211,457	208,241
Total net sales	620,298	567,653	1,167,820	1,091,244
Cost of sales
Cost of product sales	324,184	302,794	623,495	592,404
Cost of service sales	69,614	69,849	136,634	136,895
Total cost of sales	393,798	372,643	760,129	729,299
Gross profit	226,500	195,010	407,691	361,945
Research and development expenses	15,054	15,788	30,995	31,379
Selling expenses	32,665	29,055	64,185	58,513
General and administrative expenses	76,705	70,435	145,937	144,629
Operating income	102,076	79,732	166,574	127,424
Interest expense	(9,566)	(10,750)	(17,770)	(21,127)
Other income, net	3,971	3,729	8,654	7,576
Earnings from continuing operations before income taxes	96,481	72,711	157,458	113,873
Provision for income taxes	(21,693)	(22,061)	(39,027)	(30,676)
Net earnings	$ 74,788	$ 50,650	$ 118,431	$ 83,197
Basic earnings per share
Basic earnings per share (usd per share)	$ 1.69	$ 1.15	$ 2.68	$ 1.88
Diluted earnings per share
Diluted earnings per share (usd per share)	1.68	1.13	2.66	1.86
Dividends per share	$ 0.15	$ 0.13	$ 0.3	$ 0.26
Weighted average shares outstanding:
Basic (shares)	44,124	44,213	44,144	44,221
Diluted (shares)	44,553	44,807	44,604	44,825