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Goodwill
 6 Months Ended
Jun. 30, 2012
Notes to Financial Statements [Abstract]  
Goodwill
6.  
Goodwill

   
Industrial Technology
 
Energy Systems & Controls
 
Medical & Scientific  Imaging
 
RF Technology
 
Total
 
   
 (in thousands)
 
Balances at December 31, 2011
 
$
419,053
 
$
393,967
 
$
768,228
 
$
1,285,178
 
$
2,866,426
 
Goodwill acquired
   
-
   
8,629
   
6,884
   
-
   
15,513
 
Other
         
41
         
143
   
184
 
Currency translation adjustments
   
(5,187
)
 
(1,553
)
 
(1,721
)
 
(301
)
 
(8,762
)
Balances at June 30, 2012
 
$
413,866
 
$
401,084
 
$
773,391
 
$
1,285,020
 
$
2,873,361