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Business Segments (Details) - USD ($)		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales		$ 902,423,000	$ 865,281,000
Percent change in Net Sales (in hundredths)		4.30%
Gross Profit		$ 559,519,000	518,161,000
Percent change in Gross Profit (in hundredths)		8.00%
Operating profit	[1]	$ 274,163,000	270,075,000
Percent change in Operating Profit (in hundredths)	[1]	1.50%
Long-Lived assets		$ 120,322,000	125,806,000
Percent change in Long-lived assets (in hundredths)		(4.40%)
Unallocated corporate general and administrative expenses	[1]	$ 29,172	23,179
Medical And Scientific Imaging [Member]
Segment Reporting Information [Line Items]
Net sales		$ 332,214,000	291,700,000
Percent change in Net Sales (in hundredths)		13.90%
Gross Profit		$ 246,897,000	215,326,000
Percent change in Gross Profit (in hundredths)		14.70%
Operating profit	[1]	$ 114,456,000	107,779,000
Percent change in Operating Profit (in hundredths)	[1]	6.20%
Long-Lived assets		$ 40,621,000	36,347,000
Percent change in Long-lived assets (in hundredths)		11.80%
RF Technology [Member]
Segment Reporting Information [Line Items]
Net sales		$ 280,210,000	242,954,000
Percent change in Net Sales (in hundredths)		15.30%
Gross Profit		$ 160,365,000	130,046,000
Percent change in Gross Profit (in hundredths)		23.30%
Operating profit	[1]	$ 88,766,000	73,977,000
Percent change in Operating Profit (in hundredths)	[1]	20.00%
Long-Lived assets		$ 30,828,000	29,585,000
Percent change in Long-lived assets (in hundredths)		4.20%
Industrial Technology [Member]
Segment Reporting Information [Line Items]
Net sales		$ 171,235,000	190,728,000
Percent change in Net Sales (in hundredths)		(10.20%)
Gross Profit		$ 86,020,000	95,242,000
Percent change in Gross Profit (in hundredths)		(9.70%)
Operating profit	[1]	$ 46,759,000	57,897,000
Percent change in Operating Profit (in hundredths)	[1]	(19.20%)
Long-Lived assets		$ 36,802,000	44,697,000
Percent change in Long-lived assets (in hundredths)		(17.70%)
Energy Systems And Controls [Member]
Segment Reporting Information [Line Items]
Net sales		$ 118,764,000	139,899,000
Percent change in Net Sales (in hundredths)		(15.10%)
Gross Profit		$ 66,237,000	77,547,000
Percent change in Gross Profit (in hundredths)		(14.60%)
Operating profit	[1]	$ 24,182,000	30,422,000
Percent change in Operating Profit (in hundredths)	[1]	(20.50%)
Long-Lived assets		$ 12,071,000	$ 15,177,000
Percent change in Long-lived assets (in hundredths)		(20.50%)
[1] Segment operating profit is before unallocated corporate general and administrative expenses of $29,172 and $23,179 for the three months ended March 31, 2016 and 2015, respectively.

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The percent change in aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, from the previous period to the current period.

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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
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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