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Goodwill And Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2013
Goodwill And Intangible Assets [Abstract]  
Changes In The Carrying Amount Of Goodwill
The changes in the carrying amount of goodwill for the six months ended June 30, 2013 are as follows (in thousands):

Balance at December 31, 2012
 
$
160,936
 
Preliminary purchase price allocations for acquisitions (Note 7)
  
13,704
 
Purchase accounting adjustments
  
533
 
Balance at June 30, 2013
 
$
175,173
 
Summary Of Intangible Assets
The following table presents a summary of the Company's intangible assets that are subject to amortization (in thousands):

 
 
June 30, 2013
  
December 31, 2012
 
 
 
Gross
Carrying
Amounts
  
Accumulated
Amortization
  
Net
Carrying
Amounts
  
Gross
Carrying
Amounts
  
Accumulated
Amortization
  
Net
Carrying
Amounts
 
Customer relationships
 
$
26,913
  
$
(7,847
)
 
$
19,066
  
$
22,682
  
$
(7,299
)
 
$
15,383
 
Non-compete agreements
  
1,400
   
(557
)
  
843
   
1,156
   
(425
)
  
731
 
Customer backlog
  
685
   
(185
)
  
500
   
306
   
(184
)
  
122
 
Trade name
  
114
   
(17
)
  
97
   
265
   
(204
)
  
61
 
Internally developed software
  
2,584
   
(703
)
  
1,881
   
1,642
   
(589
)
  
1,053
 
Total
 
$
31,696
  
$
(9,309
)
 
$
22,387
  
$
26,051
  
$
(8,701
)
 
$
17,350
 
Estimated Useful Lives Of Identifiable Intangible Assets
The estimated useful lives of identifiable intangible assets are as follows:
 
       Customer relationships
2 – 8 years
       Non-compete agreements
1 – 5 years
       Internally developed software
1 – 7 years
       Trade name
1  year
       Customer Backlog
5 – 8 months