CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Sales
Net sales	$ 638,996	$ 620,298	$ 1,217,310	$ 1,167,820
Total net sales	638,996	620,298	1,217,310	1,167,820
Cost of sales
Total cost of sales	408,952	393,798	790,393	760,129
Gross profit	230,044	226,500	426,917	407,691
Research and development expenses	18,900	15,054	36,141	30,995
Selling expenses	30,693	32,665	62,170	64,185
General and administrative expenses	74,766	76,705	150,876	145,937
Operating income	105,685	102,076	177,730	166,574
Interest expense	(7,960)	(9,566)	(15,232)	(17,770)
Other income, net	5,871	3,971	11,349	8,654
Earnings from continuing operations before income taxes	103,596	96,481	173,847	157,458
Provision for income taxes	(23,524)	(21,693)	(38,182)	(39,027)
Net earnings	$ 80,072	$ 74,788	$ 135,665	$ 118,431
Basic earnings per share
Basic earnings per share (usd per share)	$ 1.87	$ 1.69	$ 3.17	$ 2.68
Diluted earnings per share
Diluted earnings per share (usd per share)	1.86	1.68	3.15	2.66
Dividends per share	$ 0.17	$ 0.15	$ 0.32	$ 0.30
Weighted average shares outstanding:
Basic (shares)	42,758	44,124	42,776	44,144
Diluted (shares)	43,024	44,553	43,038	44,604
Product [Member]
Product sales	$ 532,253	$ 511,676	$ 1,003,852	$ 956,363
Cost of sales
Cost of Goods and Services Sold	342,726	324,184	654,682	623,495
Service [Member]
Net Sales
Net sales	106,743	108,622	213,458	211,457
Cost of sales
Cost of Goods and Services Sold	$ 66,226	$ 69,614	$ 135,711	$ 136,634