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Other intangible assets, net (Tables)
 3 Months Ended
Mar. 31, 2012
Notes to Financial Statements [Abstract]  
Other Intangible Assets
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
 
$
1,031,208
 
$
(320,605
)
$
710,603
 
Unpatented technology
   
198,735
   
(78,048
)
 
120,687
 
Software
   
49,396
   
(37,190
)
 
12,206
 
Patents and other protective rights
   
27,575
   
(18,405
)
 
9,170
 
Trade secrets
   
1,500
   
(1,396
)
 
104
 
Assets not subject to amortization:
                   
Trade names
   
232,226
   
-
   
232,226
 
Balances at March 31, 2012
 
$
1,540,640
 
$
(455,644
)
$
1,084,996
 

Amortization expense of other intangible assets was $25,034 and $24,151 during the three months ended March 31, 2012 and 2011, respectively.