CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenue	$ 358,141	$ 332,230	$ 1,096,053	$ 1,018,973
Cost of goods sold	185,251	158,877	549,134	492,865
Gross profit	172,890	173,353	546,919	526,108
Operating expenses:
Research and development	32,986	29,593	109,271	103,674
Selling, general and administrative	76,365	69,523	234,706	219,181
Total operating expenses	109,351	99,116	343,977	322,855
Earnings from operations	63,539	74,237	202,942	203,253
Interest expense	3,696	3,096	10,361	8,930
Interest income	(256)	(268)	(721)	(1,073)
Other expense (income), net	53	2,175	(536)	1,190
Earnings from continuing operations before income taxes	60,046	69,234	193,838	194,206
Income tax provision	13,560	13,285	45,558	47,027
Earnings from continuing operations	46,486	55,949	148,280	147,179
Loss from discontinued operations, net of tax	0	(44)	0	(2,042)
Net earnings	$ 46,486	$ 55,905	$ 148,280	$ 145,137
Basic earnings per share:
Continuing operations	$ 0.33	$ 0.37	$ 1.04	$ 0.96
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Basic earnings per share	$ 0.33	$ 0.37	$ 1.04	$ 0.95
Diluted earnings per share:
Continuing operations	$ 0.32	$ 0.37	$ 1.02	$ 0.95
Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Diluted earnings per share	$ 0.32	$ 0.37	$ 1.02	$ 0.94
Weighted average shares outstanding:
Basic	141,863	150,878	142,849	152,820
Diluted	144,231	152,327	144,831	154,758