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Goodwill and intangibles (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes in goodwill
The following table shows the adjustments to goodwill during 2017 and 2016:
Balance at December 31, 2015, as restated
$
149,928

Acquisitions
81,016

Divestitures
—

Reclassifications, adjustments and other
(3,033
)
Translation adjustments
(3,260
)
Balance at December 31, 2016, as restated
$
224,651

Acquisitions
—

Divestitures
(1,854
)
Reclassifications, adjustments and other
181

Translation adjustments
14,325

Balance at December 31, 2017
$
237,303
Schedule of composition of intangible assets
The unamortized software development costs and amortization expense were as follows:
 
Year ended December 31,
 
2017
 
2016
 
2015
 
 
 
(Restated)
 
(Restated)
Unamortized software development costs
$
11,695

 
$
5,754

 
$
4,390

Software development amortization expense
3,178

 
3,507

 
55

The Company’s intangible assets consist of the following:
 
December 31, 2017
 
Cost
 
Accumulated
Amortization
 
Net
Technology
$
124,799

 
$
(70,608
)
 
$
54,191

Customer lists and relationships
128,170

 
(62,905
)
 
65,265

Capitalized software and patents
19,792

 
(7,115
)
 
12,677

Trade name
2,559

 
(2,525
)
 
34

 
$
275,320

 
$
(143,153
)
 
$
132,167


 
December 31, 2016
 
(Restated)
 
Cost
 
Accumulated
Amortization
 
Net
Technology
$
129,382

 
$
(53,142
)
 
$
76,240

Customer lists and relationships
129,650

 
(49,852
)
 
79,798

Capitalized software and patents
10,589

 
(3,923
)
 
6,666

Trade name
2,523

 
(2,259
)
 
264

 
$
272,144

 
$
(109,176
)
 
$
162,968
Schedule of estimated annual amortization expense of intangible assets for the next five years
Estimated future amortization expense of its intangible assets for the next five years is as follows:
Year ending December 31,
 
2018
$
39,218

2019
31,993

2020
20,561

2021
12,157

2022
10,601

Thereafter
17,637

Total
132,167