CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenue	$ 375,366	$ 358,141	$ 1,096,288	$ 1,096,053
Cost of goods sold	190,980	185,251	560,652	549,134
Gross profit	184,386	172,890	535,636	546,919
Operating expenses:
Research and development	34,022	32,986	106,655	109,271
Selling, general and administrative	76,295	76,365	241,737	234,706
Restructuring expenses	4,060	0	15,420	0
Total operating expenses	114,377	109,351	363,812	343,977
Earnings from operations	70,009	63,539	171,824	202,942
Interest expense	3,663	3,696	11,000	10,361
Interest income	(398)	(256)	(934)	(721)
Other (income) expense, net	(3,719)	53	(4,987)	(536)
Earnings before income taxes	70,463	60,046	166,745	193,838
Income tax provision	17,606	13,560	39,236	45,558
Net earnings	$ 52,857	$ 46,486	$ 127,509	$ 148,280
Earnings per share:
Basic	$ 0.37	$ 0.33	$ 0.90	$ 1.04
Diluted	$ 0.37	$ 0.32	$ 0.89	$ 1.02
Weighted average shares outstanding:
Basic	141,433	141,863	141,315	142,849
Diluted	143,413	144,231	143,756	144,831