CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenue	$ 389,329	$ 338,291	$ 737,912	$ 686,743
Cost of goods sold	199,288	168,262	363,884	333,988
Gross profit	190,041	170,029	374,028	352,755
Operating expenses:
Research and development	39,601	37,510	76,285	74,080
Selling, general and administrative	80,168	71,798	158,341	149,658
Total operating expenses	119,769	109,308	234,626	223,738
Earnings from operations	70,272	60,721	139,402	129,017
Interest expense	3,767	2,768	6,664	5,834
Interest income	(274)	(377)	(465)	(805)
Other expense (income), net	175	240	(589)	(984)
Earnings from continuing operations before income taxes	66,604	58,090	133,792	124,972
Income tax provision	16,446	15,685	31,998	33,742
Earnings from continuing operations	50,158	42,405	101,794	91,230
Loss from discontinued operations, net of tax	0	(1,312)	0	(1,998)
Net earnings	$ 50,158	$ 41,093	$ 101,794	$ 89,232
Basic earnings per share:
Continuing operations	$ 0.35	$ 0.28	$ 0.71	$ 0.59
Discontinued operations	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Basic earnings per share	$ 0.35	$ 0.27	$ 0.71	$ 0.58
Diluted earnings per share:
Continuing operations	$ 0.35	$ 0.27	$ 0.70	$ 0.58
Discontinued operations	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Diluted earnings per share	$ 0.35	$ 0.27	$ 0.70	$ 0.57
Weighted average shares outstanding:
Basic	142,085	153,172	143,350	153,829
Diluted	143,774	155,033	144,981	155,983