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Other intangible assets, net
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Other intangible assets, net
9.  
Other Intangible Assets, net

   
Cost
 
Accumulated
amortization
 
Net book
value
 
   
(in thousands)
 
Assets subject to amortization:
                   
Customer related intangibles
 
$
960,013
 
$
(235,885
)
$
724,128
 
Unpatented technology
   
175,819
   
(54,376
)
 
121,443
 
Software
   
49,095
   
(30,182
)
 
18,913
 
Patents and other protective rights
   
25,505
   
(15,292
)
 
10,213
 
Trade secrets
   
1,604
   
(1,174
)
 
430
 
Assets not subject to amortization:
                   
Trade names
   
229,386
   
-
   
229,386
 
Balances at December 31, 2010
 
$
1,441,422
 
$
(336,909
)
$
1,104,513
 
Assets subject to amortization:
                   
Customer related intangibles
 
$
1,015,186
 
$
(285,714
)
$
729,472
 
Unpatented technology
   
195,920
   
(70,267
)
 
125,653
 
Software
   
49,095
   
(34,718
)
 
14,377
 
Patents and other protective rights
   
26,249
   
(17,880
)
 
8,369
 
Trade secrets
   
1,604
   
(1,424
)
 
180
 
Assets not subject to amortization:
                   
Trade names
   
 231,355
   
-
   
231,355
 
Balances at September 30, 2011
 
$
1,519,409
 
$
(410,003
)
$
1,109,406
 

Amortization expense of other intangible assets was $73,466 and $59,546 during the nine months ended September 30, 2011 and 2010, respectively.