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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets [Abstract]  
Goodwill and Intangible Assets
7. Goodwill and Intangible Assets

Goodwill

Activity related to goodwill consisted of the following (in thousands):

  
2016
  
2015
 
Balance, beginning of year
 
$
269,383
  
$
236,130
 
Preliminary purchase price allocations for acquisitions (Note 6)
  
5,716
   
32,295
 
Purchase accounting adjustments
  
195
   
1,247
 
Effect of foreign currency translation adjustments
  
(89
)
  
(289
)
Balance, end of year
 
$
275,205
  
$
269,383
 

Intangible Assets with Definite Lives

Following is a summary of the Company’s intangible assets that are subject to amortization (in thousands):

  
Year Ended December 31,
 
  
2016
  
2015
 
  
Gross Carrying
Amount
  
Accumulated
Amortization
  
Net
Carrying Amount
  
Gross Carrying
Amount
  
Accumulated
Amortization
  
Net
Carrying Amount
 
Customer relationships
 
$
67,648
  
$
(30,458
)
 
$
37,190
  
$
68,959
  
$
(23,397
)
 
$
45,562
 
Non-compete agreements
  
1,018
   
(557
)
  
461
   
1,235
   
(719
)
  
516
 
Customer backlog
  
390
   
(195
)
  
195
   
350
   
(88
)
  
262
 
Trade name
  
30
   
(7
)
  
23
   
100
   
(33
)
  
67
 
Internally developed software
  
11,342
   
(4,096
)
  
7,246
   
9,500
   
(2,499
)
  
7,001
 
Total
 
$
80,428
  
$
(35,313
)
 
$
45,115
  
$
80,144
  
$
(26,736
)
 
$
53,408
 

The estimated useful lives of identifiable intangible assets are as follows:

Customer relationships
3 – 10 years
Non-compete agreements
3 – 5 years
Internally developed software
1 – 7 years
Trade name
1 year
Customer backlog
6 – 12 months

The weighted average amortization periods for customer relationships and non-compete agreements are seven years and five years, respectively. Total amortization expense for the years ended December 31, 2016, 2015, and 2014 was approximately $13.4 million, $13.8 million, and $14.5 million, respectively.

Estimated annual amortization expense for the next five years ended December 31 is as follows and excludes the impact of the acquisition referenced in Note 16, Subsequent Events (in thousands):

2017
 
$
11,465
 
2018
 
$
10,293
 
2019
 
$
9,253
 
2020
 
$
6,068
 
2021
 
$
3,993
 
Thereafter
 
$
4,043