CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Sales
Net Sales	$ 2,391,336	$ 2,487,961	$ 2,411,835
Total net sales	2,391,336	2,487,961	2,411,835
Cost of Revenue [Abstract]
Total cost of sales	1,550,109	1,589,216	1,540,574
Gross profit	841,227	898,745	871,261
Research and development expenses	74,816	72,520	64,525
Selling expenses	109,537	120,861	126,641
General and administrative expenses	303,288	301,411	306,469
Impairment of assets held for sale	33,043	0	0
Restructuring expenses	31,695
Operating income	288,848	403,953	373,626
Interest expense	35,545	31,347	33,983
Other income, net	9,748	23,856	16,596
Earnings before income taxes	263,051	396,462	356,239
Provision for income taxes	(61,659)	(88,879)	(80,490)
Net earnings	$ 201,392	$ 307,583	$ 275,749
Basic earnings per share
Basic earnings per share	$ 4.83	$ 7.20	$ 6.28
Diluted earnings per share
Diluted earnings per share	4.80	7.15	6.22
Dividends per share	$ 0.68	$ 0.66	$ 0.60
Weighted average shares outstanding:
Basic	41,738	42,739	43,892
Diluted	41,999	43,016	44,316
Product [Member]
Net Sales
Net Sales	$ 2,041,086	$ 2,073,530	$ 1,993,249
Cost of Revenue [Abstract]
Cost of Goods and Services Sold	1,319,562	1,329,761	1,272,599
Service [Member]
Net Sales
Net Sales	350,250	414,431	418,586
Cost of Revenue [Abstract]
Cost of Goods and Services Sold	$ 230,547	$ 259,455	$ 267,975