CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales
Product sales	$ 459,774	$ 427,324	$ 883,003	$ 830,242
Service sales	107,879	105,442	208,241	206,031
Total net sales	567,653	532,766	1,091,244	1,036,273
Cost of sales
Cost of product sales	299,739	279,869	586,231	544,604
Cost of service sales	69,144	67,518	135,468	134,387
Total cost of sales	368,883	347,387	721,699	678,991
Gross profit	198,770	185,379	369,545	357,282
Research and development expenses	15,501	15,236	30,799	30,396
Selling expenses	28,560	29,126	57,513	58,752
General and administrative expenses	71,438	72,928	146,735	142,782
Operating income	83,271	68,089	134,498	125,352
Interest expense	(10,750)	(10,273)	(21,127)	(20,206)
Other income, net	190	101	502	335
Earnings from continuing operations before income taxes	72,711	57,917	113,873	105,481
Provision for income taxes	(22,061)	(17,954)	(30,676)	(32,699)
Net earnings	$ 50,650	$ 39,963	$ 83,197	$ 72,782
Basic earnings per share
Basic earnings per share (usd per share)	$ 1.15	$ 0.90	$ 1.88	$ 1.63
Diluted earnings per share
Diluted earnings per share (usd per share)	1.13	0.88	1.86	1.61
Dividends per share	$ 0.13	$ 0.13	$ 0.26	$ 0.26
Weighted average shares outstanding:
Basic (shares)	44,213	44,487	44,221	44,526
Diluted (shares)	44,807	45,164	44,825	45,195