CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net sales
Product sales	$ 413,905	$ 427,732	$ 1,244,148	$ 1,313,290
Service sales	93,187	97,803	299,218	303,638
Total net sales	507,092	525,535	1,543,366	1,616,928
Cost of sales
Cost of product sales	261,488	284,007	806,092	864,701
Cost of service sales	61,128	56,034	195,515	193,286
Total cost of sales	322,616	340,041	1,001,607	1,057,987
Gross profit	184,476	185,494	541,759	558,941
Research and development expenses	14,071	15,050	44,467	45,633
Selling expenses	26,273	30,247	85,025	90,440
General and administrative expenses	67,559	76,384	210,342	220,778
Operating income	76,573	63,813	201,925	202,090
Interest expense	(10,488)	(8,972)	(30,694)	(26,953)
Other income, net	483	161	818	605
Earnings from continuing operations before income taxes	66,568	55,002	172,049	175,742
Provision for income taxes	(20,636)	(16,860)	(53,335)	(54,256)
Earnings from continuing operations	45,932	38,142	118,714	121,486
Loss from discontinued operations, net of taxes	0	(4,258)	0	(45,874)
Net earnings	$ 45,932	$ 33,884	$ 118,714	$ 75,612
Basic earnings per share
Earnings from continuing operations (usd per share)	$ 1.04	$ 0.82	$ 2.67	$ 2.58
Earnings from discontinued operations (usd per share)	0.00	(0.09)	0.00	(0.97)
Total, Basic earnings per share (usd per share)	1.04	0.73	2.67	1.61
Diluted earnings per share
Earnings from continuing operations (usd per share)	1.02	0.80	2.63	2.53
Earnings from discontinued operations (usd per share)	0.00	(0.09)	0.00	(0.96)
Total, Diluted earnings per share (usd per share)	1.02	0.71	2.63	1.57
Dividends per share	$ 0.13	$ 0.13	$ 0.39	$ 0.39
Weighted average shares outstanding:
Basic (shares)	44,323	46,366	44,457	47,082
Diluted (shares)	44,997	47,395	45,128	48,106