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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
 
December 31, 2018

December 31, 2017

Cost
(in thousands)
Customer relationships acquired
$
109,622

$
91,230

Technology asset acquired
11,169

11,169

Order backlog
31,220

18,208

Trade names/ brands acquired
2,766

2,766

Volunteer list acquired
1,325

1,325

Non-compete arrangements
489

489

Mapi intangible asset

32,305

Foreign exchange movement
(5,085
)
(2,389
)
Total cost
151,506

155,103

Accumulated amortization
(100,249
)
(84,898
)
Foreign exchange movement
2,798

1,423

 
Net book value
$
54,055

$
71,628

Schedule of Future Intangible Asset Amortization Expense
Future intangible asset amortization expense for the years ended December 31, 2019 to December 31, 2023 is as follows:
 
 
Year Ended December 31,(in thousands)

2019
$
13,183

2020
12,895

2021
10,857

2022
6,069

2023
4,221

 
$
47,225