CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Net [Abstract]
Product sales	$ 1,796,802	$ 1,815,028	$ 1,719,591
Service sales	408,881	428,098	398,490
Net sales	2,205,683	2,243,126	2,118,081
Cost of Revenue [Abstract]
Cost of product sales	1,156,596	1,190,714	1,123,291
Cost of service sales	265,832	275,896	258,951
Total cost of sales	1,422,428	1,466,610	1,382,242
Gross profit	783,255	776,516	735,839
Research and development expenses	(60,837)	(67,842)	(63,580)
Selling expenses	(121,482)	(128,005)	(128,473)
General and administrative expenses	(290,319)	(298,296)	(306,663)
Operating income	310,617	282,373	237,123
Interest expense	(36,038)	(35,794)	(37,053)
Other income, net	615	365	980
Earnings before income taxes	275,194	246,944	201,050
Provision for income taxes	(82,946)	(76,995)	(61,646)
Earnings from continuing operations	192,248	169,949	139,404
Discontinued operations, net of taxes
Loss from discontinued operations, net of taxes	(46,787)	(56,611)	(1,423)
Net earnings	$ 145,461	$ 113,338	$ 137,981
Basic earnings per share
Earnings from continuing operations	$ 4.12	$ 3.54	$ 2.97
Earnings from discontinued operations	(1.00)	(1.18)	(0.03)
Total	3.12	2.36	2.94
Diluted earnings per share
Earnings from continuing operations	4.04	3.46	2.91
Earnings from discontinued operations	(0.99)	(1.15)	(0.03)
Total	3.05	2.31	2.88
Dividends per share	$ 0.52	$ 0.52	$ 0.39
Weighted average shares outstanding:
Basic	46,624	48,019	46,991
Diluted	47,616	49,075	47,912