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Business Segments (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales		$ 945,144		$ 883,933		$ 2,779,125	$ 2,638,755
Percent change in net sales		6.90%				5.30%
Gross profit		$ 578,493		533,483		$ 1,705,532	1,585,555
Percent change in gross profit		8.40%				7.60%
Operating profit		$ 298,341	[1]	277,601	[1]	$ 855,189	826,767
Percent change in operating profit		7.50%	[1]			3.40%
Long-lived assets		$ 116,081		119,473		$ 116,081	119,473
Percent change in long-lived assets						(2.80%)
Operating Segments [Member] | Medical And Scientific Imaging [Member]
Segment Reporting Information [Line Items]
Net sales		$ 338,027		299,621		$ 1,010,826	893,583
Percent change in net sales		12.80%				13.10%
Gross profit		$ 247,432		222,655		$ 740,725	660,971
Percent change in gross profit		11.10%				12.10%
Operating profit		$ 118,979	[1]	108,399	[1]	$ 347,706	325,439
Percent change in operating profit		9.80%	[1]			6.80%
Long-lived assets		$ 38,793		35,818		$ 38,793	35,818
Percent change in long-lived assets						8.30%
Operating Segments [Member] | RF Technology [Member]
Segment Reporting Information [Line Items]
Net sales		$ 303,565		253,556		$ 872,536	752,068
Percent change in net sales		19.70%				16.00%
Gross profit		$ 169,123		133,692		$ 492,493	397,874
Percent change in gross profit		26.50%				23.80%
Operating profit		$ 94,785	[1]	74,604	[1]	$ 272,905	228,521
Percent change in operating profit		27.10%	[1]			19.40%
Long-lived assets		$ 30,984		29,570		$ 30,984	29,570
Percent change in long-lived assets						4.80%
Operating Segments [Member] | Industrial Technology [Member]
Segment Reporting Information [Line Items]
Net sales		$ 178,317		186,147		$ 528,179	563,342
Percent change in net sales		(4.20%)				(6.20%)
Gross profit		$ 90,950		92,245		$ 266,679	281,052
Percent change in gross profit		(1.40%)				(5.10%)
Operating profit		$ 52,800	[1]	52,298	[1]	$ 150,850	162,383
Percent change in operating profit		1.00%	[1]			(7.10%)
Long-lived assets		$ 35,584		40,170		$ 35,584	40,170
Percent change in long-lived assets						(11.40%)
Operating Segments [Member] | Energy Systems And Controls [Member]
Segment Reporting Information [Line Items]
Net sales		$ 125,235		144,609		$ 367,584	429,762
Percent change in net sales		(13.40%)				(14.50%)
Gross profit		$ 70,988		84,891		$ 205,635	245,658
Percent change in gross profit		(16.40%)				(16.30%)
Operating profit		$ 31,777	[1]	42,300	[1]	$ 83,728	110,424
Percent change in operating profit		(24.90%)	[1]			(24.20%)
Long-lived assets		$ 10,720		13,915		$ 10,720	13,915
Percent change in long-lived assets						(23.00%)
Corporate [Member]
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	[1]	$ 30,951		$ 27,230		$ 89,730	$ 77,526
[1] *Segment operating profit is before unallocated corporate general and administrative expenses. These expenses were $30,951 and $27,230 for the three months ended September 30, 2016 and 2015, respectively, and $89,730 and $77,526 for the nine months ended September 30, 2016 and 2015, respectively.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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