CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Sales
Net sales	$ 614,880	$ 595,393	$ 1,832,190	$ 1,763,213
Total net sales	614,880	595,393	1,832,190	1,763,213
Cost of sales
Total cost of sales	388,804	372,875	1,179,197	1,133,004
Gross profit	226,076	222,518	652,993	630,209
Research and development expenses	18,362	14,239	54,503	45,234
Selling expenses	28,133	30,361	90,303	94,546
General and administrative expenses	74,012	80,871	224,888	226,808
Operating income	105,569	97,047	283,299	263,621
Interest expense	(7,951)	(7,949)	(23,183)	(25,719)
Other income, net	6,355	3,843	17,704	12,497
Earnings from continuing operations before income taxes	103,973	92,941	277,820	250,399
Provision for income taxes	(21,463)	(18,458)	(59,645)	(57,485)
Net earnings	$ 82,510	$ 74,483	$ 218,175	$ 192,914
Basic earnings per share
Basic earnings per share (usd per share)	$ 1.93	$ 1.70	$ 5.10	$ 4.38
Diluted earnings per share
Diluted earnings per share (usd per share)	1.92	1.68	5.07	4.33
Dividends per share	$ 0.17	$ 0.15	$ 0.49	$ 0.45
Weighted average shares outstanding:
Basic (shares)	42,709	43,892	42,755	44,060
Diluted (shares)	42,995	44,334	43,025	44,513
Product [Member]
Product sales	$ 516,760	$ 495,197	$ 1,520,612	$ 1,451,560
Cost of sales
Cost of Goods and Services Sold	331,793	312,702	986,475	936,197
Service [Member]
Net Sales
Net sales	98,120	100,196	311,578	311,653
Cost of sales
Cost of Goods and Services Sold	$ 57,011	$ 60,173	$ 192,722	$ 196,807