CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Sales
Net Sales	$ 2,411,835	$ 2,271,026	$ 2,108,931
Total net sales	2,411,835	2,271,026	2,108,931
Cost of Revenue [Abstract]
Total cost of sales	1,540,574	1,470,241	1,374,240
Gross profit	871,261	800,785	734,691
Research and development expenses	(64,525)	(61,393)	(59,424)
Selling expenses	(126,641)	(121,873)	(113,164)
General and administrative expenses	(306,469)	(292,399)	(265,584)
Operating income	373,626	325,120	296,519
Interest expense	(33,983)	(41,471)	(41,248)
Other income, net	16,596	15,970	12,690
Earnings before income taxes	356,239	299,619	267,961
Provision for income taxes	(80,490)	(84,728)	(78,579)
Earnings from continuing operations	275,749	214,891	189,382
Discontinued operations, net of taxes
Loss from discontinued operations, net of taxes	0	0	2,053
Net earnings	$ 275,749	$ 214,891	$ 187,329
Basic earnings per share
Earnings from continuing operations	$ 6.28	$ 4.86	$ 4.27
Earnings from discontinued operations	0.00	0.00	(0.05)
Total	6.28	4.86	4.22
Diluted earnings per share
Earnings from continuing operations	6.22	4.80	4.20
Earnings from discontinued operations	0.00	0.00	(0.05)
Total	6.22	4.80	4.15
Dividends per share	$ 0.60	$ 0.56	$ 0.52
Weighted average shares outstanding:
Basic	43,892	44,182	44,389
Diluted	44,316	44,761	45,045
Product [Member]
Net Sales
Net Sales	$ 1,993,249	$ 1,854,216	$ 1,714,358
Cost of Revenue [Abstract]
Cost of Goods and Services Sold	1,272,599	1,198,881	1,113,078
Service [Member]
Net Sales
Net Sales	418,586	416,810	394,573
Cost of Revenue [Abstract]
Cost of Goods and Services Sold	$ 267,975	$ 271,360	$ 261,162