CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Revenue	$ 332,230	$ 371,327	$ 1,018,973	$ 1,138,850
Cost of goods sold	158,877	169,430	492,865	535,030
Gross profit	173,353	201,897	526,108	603,820
Operating expenses
Research and development	29,593	35,188	103,674	112,257
Selling, general and administrative	69,523	81,300	219,181	288,036
Total operating expenses	99,116	116,488	322,855	400,293
Earnings from operations	74,237	85,409	203,253	203,527
Interest expense	3,096	1,526	8,930	2,311
Interest income	(268)	(155)	(1,073)	(505)
Other expense (income), net	2,175	66	1,190	(1,206)
Earnings from continuing operations before income taxes	69,234	83,972	194,206	202,927
Income tax provision	13,285	19,582	47,027	57,109
Earnings from continuing operations	55,949	64,390	147,179	145,818
(Loss) earnings from discontinued operations, net of tax	(44)	329	(2,042)	(475)
Net earnings	$ 55,905	$ 64,719	$ 145,137	$ 145,343
Basic earnings per share:
Continuing operations (in dollars per share)	$ 0.37	$ 0.41	$ 0.96	$ 0.92
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00
Basic earnings per share (in dollars per share)	$ 0.37	$ 0.41	$ 0.95	$ 0.91
Diluted earnings per share:
Continuing operations (in dollars per share)	$ 0.37	$ 0.40	$ 0.95	$ 0.90
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.00
Diluted earnings per share (in dollars per share)	$ 0.37	$ 0.40	$ 0.94	$ 0.90
Weighted average shares outstanding:
Basic (in shares)	150,878	158,665	152,820	159,225
Diluted (in shares)	152,327	160,798	154,758	161,811