CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 381,928	$ 375,366	$ 1,119,420	$ 1,096,288
Cost of goods sold	201,189	190,980	573,169	560,652
Gross profit	180,739	184,386	546,251	535,636
Operating expenses:
Research and development	31,050	34,022	100,898	106,655
Selling, general and administrative	73,380	76,295	231,991	241,737
Restructuring expenses	327	4,060	1,095	15,420
Total operating expenses	104,757	114,377	333,984	363,812
Earnings from operations	75,982	70,009	212,267	171,824
Interest expense	3,670	3,663	10,689	11,000
Interest income	(319)	(398)	(861)	(934)
Other expense (income), net	1,455	(3,719)	1,775	(4,987)
Earnings before income taxes	71,176	70,463	200,664	166,745
Income tax (benefit) provision	(1,896)	17,606	29,182	39,236
Net earnings	$ 73,072	$ 52,857	$ 171,482	$ 127,509
Earnings per share:
Basic	$ 0.52	$ 0.37	$ 1.23	$ 0.90
Diluted	$ 0.52	$ 0.37	$ 1.21	$ 0.89
Weighted average shares outstanding:
Basic	139,596	141,433	139,808	141,315
Diluted	140,525	143,413	141,262	143,756