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Intangible Assets, Net
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
Changes in the carrying amount of intangible assets were as follows for the periods indicated:
(amounts in thousands)
 
Balance as of December 31, 2017
$
166,313

Acquisitions
70,057

Acquisition remeasurements
(1,363
)
Additions, (net of $172 write-offs)
24,553

Amortization
(22,208
)
Currency translation
(11,799
)
Balance as of December 31, 2018
$
225,553

Acquisitions
17,702

Acquisition remeasurements
5,735

Additions, (net of $112 write-offs)
33,796

Amortization
(30,956
)
Currency translation
(1,503
)
Balance as of December 31, 2019
$
250,327


The cost and accumulated amortization values of our intangible assets were as follows as of December 31:
 
2019
(amounts in thousands)
Cost
 
Accumulated
Amortization
 
Net
Book Value
Customer relationships and agreements
$
151,540

 
$
(57,326
)
 
$
94,214

Software
92,821

 
(18,222
)
 
74,599

Trademarks and trade names
58,088

 
(7,512
)
 
50,576

Patents, licenses and rights
45,392

 
(14,454
)
 
30,938

Total amortizable intangibles
$
347,841

 
$
(97,514
)
 
$
250,327

 
2018
(amounts in thousands)
Cost
 
Accumulated
Amortization
 
Net
Book Value
Customer relationships and agreements
$
134,999

 
$
(45,418
)
 
$
89,581

Software
62,147

 
(14,053
)
 
48,094

Trademarks and trade names
57,513

 
(5,050
)
 
52,463

Patents, licenses and rights
47,804

 
(12,389
)
 
35,415

Total amortizable intangibles
$
302,463

 
$
(76,910
)
 
$
225,553


We have capitalized a total of $60.2 million related to the application development stage of our global ERP system implementation, including $31.8 million during the year ended December 31, 2019. As of December 31, 2019, we have placed $52.0 million in service and began amortizing the cost of our global ERP system over its estimated useful life of 15 years.
Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of such assets may not be recoverable. Intangible assets that become fully amortized are removed from the accounts in the period that they become fully amortized. Amortization expense was recorded as follows:
(amounts in thousands)
2019
 
2018
 
2017
Amortization expense
$
30,956

 
$
22,208

 
$
15,896


Estimated future amortization expense:
(amounts in thousands)
 
2020
$
28,054

2021
27,406

2022
26,393

2023
23,246

2024
22,220

Thereafter
123,008

 
$
250,327