CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue	$ 369,380	$ 389,329	$ 720,923	$ 737,912
Cost of goods sold	186,662	199,288	369,673	363,884
Gross profit	182,718	190,041	351,250	374,028
Operating expenses:
Research and development	36,307	39,601	72,633	76,285
Selling, general and administrative	83,500	80,168	165,442	158,341
Restructuring expenses	3,547	0	11,361	0
Total operating expenses	123,354	119,769	249,436	234,626
Earnings from operations	59,364	70,272	101,814	139,402
Interest expense	3,629	3,767	7,337	6,664
Interest income	(272)	(274)	(536)	(465)
Other income, net	(1,070)	175	(1,269)	(589)
Earnings before income taxes	57,077	66,604	96,282	133,792
Income tax provision	12,319	16,446	21,630	31,998
Net earnings	$ 44,758	$ 50,158	$ 74,652	$ 101,794
Earnings per share:
Basic	$ 0.32	$ 0.35	$ 0.53	$ 0.71
Diluted	$ 0.31	$ 0.35	$ 0.52	$ 0.70
Weighted average shares outstanding:
Basic	141,574	142,085	141,255	143,350
Diluted	144,120	143,774	143,964	144,981