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Other intangible assets, net
6 Months Ended
Jun. 30, 2012
Notes to Financial Statements [Abstract]  
Other intangible assets, net
7.  
Other Intangible Assets, net

   
Cost
 
Accumulated
amortization
 
Net book
value
 
   
(in thousands)
 
Assets subject to amortization:
                   
Customer related intangibles
 
$
1,022,134
 
$
(302,156
)
$
719,978
 
Unpatented technology
   
193,915
   
(72,358
)
 
121,557
 
Software
   
49,395
   
(35,833
)
 
13,562
 
Patents and other protective rights
   
25,398
   
(17,699
)
 
7,699
 
Trade secrets
   
1,500
   
(1,361
)
 
139
 
Assets not subject to amortization:
                   
Trade names
   
231,207
   
-
   
231,207
 
Balances at December 31, 2011
 
$
1,523,549
 
$
(429,407
)
$
1,094,142
 
           
Assets subject to amortization:
                   
Customer related intangibles
 
$
1,030,543
 
$
(332,805
)
$
697,738
 
Unpatented technology
   
203,621
   
(86,591
)
 
117,030
 
Software
   
49,396
   
(38,330
)
 
11,066
 
Patents and other protective rights
   
27,654
   
(19,124
)
 
8,530
 
Trade secrets
   
1,500
   
(1,431
)
 
69
 
Assets not subject to amortization:
                   
Trade names
   
 230,691
   
-
   
230,691
 
Balances at June 30, 2012
 
$
1,543,405
 
$
(478,281
)
$
1,065,124
 

Amortization expense of other intangible assets was $50,336 and $48,376 during the six months ended June 30, 2012 and 2011, respectively.