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Note 5 - Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Text Block]
 (5)             Goodwill and Intangible Assets

 Goodwill at December 31, 2012 and March 31, 2013 consists of the following (in thousands):

   
December 31,
2012
   
March 31,
2013
 
Balance at  beginning of period
  $ 300,260     $ 370,143  
Goodwill acquired during the period
    60,374       —  
Adjustments to prior year acquisitions
    7,109       (592 )
Effect of foreign currency translation
    2,400       (2,693 )
Balance at end of period
  $ 370,143     $ 366,858  

Intangible assets at December 31, 2012 and March 31, 2013, consist of the following (in thousands):

           
December 31, 2012
 
 
Estimated
useful lives
(months)
   
Gross
carrying
amount
   
Accumulated
amortization
   
Net
carrying
value
 
Amortizable intangible assets:
                         
Customer relationships
40
to
60
   
$
204,699
   
$
(90,040)
   
$
114,659
 
Tradenames
45
to
84
     
60,620
     
(24,413)
     
36,207
 
Covenants not to compete
 
36
       
3,116
     
(2,313)
     
803
 
Technology
24
to
40
     
7,530
     
(6,303)
     
1,227
 
Totals
         
$
275,965
   
$
(123,069)
   
$
152,896
 

           
March 31, 2013
 
 
Estimated
useful lives
(months)
   
Gross
carrying
amount
   
Accumulated
amortization
   
Net
carrying
value
 
Amortizable intangible assets:
                         
Customer relationships
40
to
60
   
$
202,186
   
$
(100,126)
   
$
102,060
 
Tradenames
45
to
84
     
59,876
     
(27,103)
     
32,773
 
Covenants not to compete
 
36
       
3,102
     
(2,451)
     
651
 
Technology
24
to
40
     
7,382
     
(6,643)
     
739
 
Totals
         
$
272,546
   
$
(136,323)
   
$
136,223
 

The aggregate intangible amortization expense was $12.8 million and $14.9 million for the three months ended March 31, 2012 and 2013, respectively. The estimated future amortization expense of intangible assets is as follows (in thousands):

   
Amount
 
       
Nine months ended December 31, 2013
  $ 40,981  
Year ended December 31:
       
2014
    39,805  
2015
    29,769  
2016
    16,166  
2017
    9,088  
Thereafter
    414  
  Total
  $ 136,223