CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net sales
Product sales	$ 427,324	$ 439,871	$ 830,242	$ 885,558
Service sales	105,442	105,323	206,031	205,835
Total net sales	532,766	545,194	1,036,273	1,091,393
Cost of sales
Cost of product sales	279,869	287,685	544,604	580,694
Cost of service sales	67,518	75,158	134,387	137,252
Total cost of sales	347,387	362,843	678,991	717,946
Gross profit	185,379	182,351	357,282	373,447
Research and development expenses	15,236	15,321	30,396	30,583
Selling expenses	29,126	29,105	58,752	60,193
General and administrative expenses	72,928	72,483	142,782	144,394
Operating income	68,089	65,442	125,352	138,277
Interest expense	(10,273)	(8,985)	(20,206)	(17,981)
Other income (expense), net	101	(37)	335	444
Earnings from continuing operations before income taxes	57,917	56,420	105,481	120,740
Provision for income taxes	(17,954)	(16,299)	(32,699)	(37,396)
Earnings from continuing operations	39,963	40,121	72,782	83,344
Loss from discontinued operations, net of taxes	0	(14,384)	0	(41,616)
Net earnings	$ 39,963	$ 25,737	$ 72,782	$ 41,728
Basic earnings per share
Earnings from continuing operations (usd per share)	$ 0.90	$ 0.85	$ 1.63	$ 1.76
Earnings from discontinued operations (usd per share)	0.00	(0.31)	0.00	(0.88)
Total, Basic earnings per share (usd per share)	0.90	0.54	1.63	0.88
Diluted earnings per share
Earnings from continuing operations (usd per share)	0.88	0.83	1.61	1.72
Earnings from discontinued operations (usd per share)	0.00	(0.30)	0.00	(0.86)
Total, Diluted earnings per share (usd per share)	0.88	0.53	1.61	0.86
Dividends per share	$ 0.13	$ 0.13	$ 0.26	$ 0.26
Weighted average shares outstanding:
Basic (shares)	44,487	47,224	44,526	47,466
Diluted (shares)	45,164	48,258	45,195	48,487