CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue, Net [Abstract]
Product sales	$ 1,714,358	$ 1,796,802	$ 1,815,028
Service sales	394,573	408,881	428,098
Net sales	2,108,931	2,205,683	2,243,126
Cost of Revenue [Abstract]
Cost of product sales	1,100,287	1,156,596	1,190,714
Cost of service sales	258,161	265,832	275,896
Total cost of sales	1,358,448	1,422,428	1,466,610
Gross profit	750,483	783,255	776,516
Research and development expenses	(58,592)	(60,837)	(67,842)
Selling expenses	(111,228)	(121,482)	(128,005)
General and administrative expenses	(272,565)	(290,319)	(298,296)
Operating income	308,098	310,617	282,373
Interest expense	(41,248)	(36,038)	(35,794)
Other income, net	1,111	615	365
Earnings before income taxes	267,961	275,194	246,944
Provision for income taxes	(78,579)	(82,946)	(76,995)
Earnings from continuing operations	189,382	192,248	169,949
Discontinued operations, net of taxes
Loss from discontinued operations, net of taxes	2,053	46,787	56,611
Net earnings	$ 187,329	$ 145,461	$ 113,338
Basic earnings per share
Earnings from continuing operations	$ 4.27	$ 4.12	$ 3.54
Earnings from discontinued operations	(0.05)	(1.00)	(1.18)
Total	4.22	3.12	2.36
Diluted earnings per share
Earnings from continuing operations	4.20	4.04	3.46
Earnings from discontinued operations	(0.05)	(0.99)	(1.15)
Total	4.15	3.05	2.31
Dividends per share	$ 0.52	$ 0.52	$ 0.52
Weighted average shares outstanding:
Basic	44,389	46,624	48,019
Diluted	45,045	47,616	49,075