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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
4. Goodwill and Other Intangible Assets
Changes in the Company’s goodwill balance for the three months ended March 31, 2017 are summarized in the table below (in thousands):
Balance at December 31, 2016
$
69,097

Acquired in business combinations
13,574

Foreign currency translation adjustment
132

Balance at March 31, 2017
$
82,803


Intangible assets, net, include the estimated acquisition-date fair values of customer relationships, marketing-related assets, and developed technology that the Company recorded as part of its business acquisitions.
The following is a summary of the Company’s intangible assets, net (in thousands):
 
Estimated Useful
Life (Years)
 
Gross
Carrying Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
March 31, 2017:
 
 
 
 
 
 
 
Customer relationships
1-10
 
$
36,358

 
$
13,396

 
$
22,962

Trade name
1.5-3
 
2,808

 
2,564

 
244

Developed technology
4-7
 
19,704

 
7,977

 
11,727

Total intangible assets
 
 
$
58,870

 
$
23,937

 
$
34,933

 
Estimated Useful
Life (Years)
 
Gross
Carrying Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
December 31, 2016:
 
 
 
 
 
 
 
Customer relationships
1-10
 
$
32,703

 
$
12,418

 
$
20,285

Trade name
1.5-3
 
2,636

 
2,462

 
174

Developed technology
4-7
 
15,228

 
7,175

 
8,053

Total intangible assets
 
 
$
50,567

 
$
22,055

 
$
28,512

The following table summarizes the Company's weighted-average amortization period, in total and by major finite-lived intangible asset class (in years), as of:
 
March 31, 2017
 
December 31, 2016
Customer relationships
9.3
 
9.3
Trade name
2.7
 
2.8
Developed technology
6.5
 
6.3
Total weighted-average amortization period
8.0
 
8.0

The Company periodically reviews the estimated useful lives of its identifiable intangible assets, taking into consideration any events or circumstances that might result in either a diminished fair value or revised useful life. There have been no indicators of impairment or change in the useful life during the three months ended March 31, 2017 and 2016. Total amortization expense was $1.8 million and $1.9 million during the three months ended March 31, 2017 and 2016, respectively.
Estimated annual amortization expense for the next five years and thereafter is as follows (in thousands):
 
Amortization
Expense
Year ending December 31:
 
Remainder of 2017
$
5,344

2018
6,719

2019
5,854

2020
4,887

2021 and thereafter
12,129

Total
$
34,933