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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets [Abstract]  
Goodwill and Intangible Assets
8. Goodwill and Intangible Assets
 
Goodwill represents the excess purchase price over the fair value of net assets acquired, or net liabilities assumed, in a business combination. In accordance with ASC Topic 350, Intangibles – Goodwill and Other, the Company performs an annual impairment review in the fourth quarter and more frequently if events or changes in circumstances indicate that goodwill might be impaired. There was no indication that goodwill became impaired as of June 30, 2017.

Other intangible assets include customer relationships, non-compete arrangements, trade names, customer backlog, and internally developed software, which are being amortized over the assets' estimated useful lives using the straight-line method. Estimated useful lives range from less than one year to ten years. Amortization of customer relationships, non-compete arrangements, trade names, customer backlog, and internally developed software is considered an operating expense and is included in "Amortization" in the accompanying Unaudited Condensed Consolidated Statements of Operations. The Company periodically reviews the estimated useful lives of its identifiable intangible assets, taking into consideration any events or circumstances that might result in a lack of recoverability or revised useful life.

Goodwill
 
The changes in the carrying amount of goodwill for the six months ended June 30, 2017 are as follows (in thousands):
 
Balance at December 31, 2016
 
$
275,205
 
Preliminary purchase price allocations for acquisitions
  
29,030
 
Effect of foreign currency translation adjustments
  
221
 
Balance at June 30, 2017
 
$
304,456
 
 
Intangible Assets with Definite Lives
 
The following table presents a summary of the Company's intangible assets that are subject to amortization (in thousands):
 
 
 
June 30, 2017
  
December 31, 2016
 
 
 
Gross
Carrying
Amounts
  
Accumulated
Amortization
  
Net
Carrying
Amounts
  
Gross
Carrying
Amounts
  
Accumulated
Amortization
  
Net
Carrying
Amounts
 
Customer relationships
 
$
75,857
  
$
(26,603
)
 
$
49,254
  
$
67,648
  
$
(30,458
)
 
$
37,190
 
Non-compete agreements
  
1,586
   
(546
)
  
1,040
   
1,018
   
(557
)
  
461
 
Customer backlog
  
1,640
   
(41
)
  
1,599
   
390
   
(195
)
  
195
 
Trade name
  
170
   
(40
)
  
130
   
30
   
(7
)
  
23
 
Internally developed software
  
11,283
   
(4,265
)
  
7,018
   
11,342
   
(4,096
)
  
7,246
 
Total
 
$
90,536
  
$
(31,495
)
 
$
59,041
  
$
80,428
  
$
(35,313
)
 
$
45,115
 
 
The estimated useful lives of identifiable intangible assets are as follows:
 
Customer relationships
5 – 10 years
Non-compete agreements
2 – 5 years
Internally developed software
1 – 7 years
Trade name
1  year
Customer backlog
6 months – 1 year
 
Estimated annual amortization expense for the next five years ended December 31 and thereafter is as follows (in thousands):

2017 remaining
 
$
7,985
 
2018
 
$
14,209
 
2019
 
$
12,346
 
2020
 
$
9,262
 
2021
 
$
7,201
 
Thereafter
 
$
8,038