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Business Segments (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Net sales $ 889,541,000 $ 885,175,000 $ 1,754,822,000 $ 1,719,227,000
Percent change in Net Sales (in hundredths) 0.50%   2.10%  
Gross Profit $ 533,911,000 523,182,000 $ 1,052,072,000 1,012,118,000
Percent change in Gross Profit (in hundredths) 2.10%   3.90%  
Operating profit $ 279,091,000 [1] 270,877,000 [1] $ 549,166,000 516,289,000
Percent change in Operating Profit (in hundredths) 3.00% [1]   6.40%  
Long-Lived assets $ 126,961,000 136,193,000 $ 126,961,000 136,193,000
Percent change in Long-lived assets (in hundredths)     (6.80%)  
Unallocated corporate general and administrative expenses [1] 27,117 24,211 $ 50,296 46,223
Industrial Technology [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 186,467,000 204,814,000 $ 377,195,000 401,815,000
Percent change in Net Sales (in hundredths) (9.00%)   (6.10%)  
Gross Profit $ 93,565,000 103,982,000 $ 188,807,000 202,452,000
Percent change in Gross Profit (in hundredths) (10.00%)   (6.70%)  
Operating profit $ 52,188,000 [1] 60,438,000 [1] $ 110,085,000 116,494,000
Percent change in Operating Profit (in hundredths) (13.70%) [1]   (5.50%)  
Long-Lived assets $ 44,343,000 48,848,000 $ 44,343,000 48,848,000
Percent change in Long-lived assets (in hundredths)     (9.20%)  
Energy Systems And Controls [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 145,254,000 165,868,000 $ 285,153,000 321,039,000
Percent change in Net Sales (in hundredths) (12.40%)   (11.20%)  
Gross Profit $ 83,220,000 95,857,000 $ 160,767,000 181,822,000
Percent change in Gross Profit (in hundredths) (13.20%)   (11.60%)  
Operating profit $ 37,702,000 [1] 44,786,000 [1] $ 68,124,000 81,811,000
Percent change in Operating Profit (in hundredths) (15.80%) [1]   (16.70%)  
Long-Lived assets $ 15,048,000 18,027,000 $ 15,048,000 18,027,000
Percent change in Long-lived assets (in hundredths)     (16.50%)  
Medical And Scientific Imaging [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 302,262,000 268,891,000 $ 593,962,000 525,090,000
Percent change in Net Sales (in hundredths) 12.40%   13.10%  
Gross Profit $ 222,990,000 194,756,000 $ 438,316,000 379,606,000
Percent change in Gross Profit (in hundredths) 14.50%   15.50%  
Operating profit $ 109,261,000 [1] 94,381,000 [1] $ 217,040,000 184,152,000
Percent change in Operating Profit (in hundredths) 15.80% [1]   17.90%  
Long-Lived assets $ 37,172,000 39,815,000 $ 37,172,000 39,815,000
Percent change in Long-lived assets (in hundredths)     (6.60%)  
RF Technology [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 255,558,000 245,602,000 $ 498,512,000 471,283,000
Percent change in Net Sales (in hundredths) 4.10%   5.80%  
Gross Profit $ 134,136,000 128,587,000 $ 264,182,000 248,238,000
Percent change in Gross Profit (in hundredths) 4.30%   6.40%  
Operating profit $ 79,940,000 [1] 71,272,000 [1] $ 153,917,000 133,832,000
Percent change in Operating Profit (in hundredths) 12.20% [1]   15.00%  
Long-Lived assets $ 30,398,000 $ 29,503,000 $ 30,398,000 $ 29,503,000
Percent change in Long-lived assets (in hundredths)     3.00%  
[1] Segment operating profit is before unallocated corporate general and administrative expenses. These expenses were $27,117 and $24,211 for the three months ended June 30, 2015 and 2014, respectively, and $50,296 and $46,223 for the six months ended June 30, 2015 and 2014, respectively.