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INTANGIBLES
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLES
INTANGIBLES
Goodwill and other intangible assets with indefinite lives are not amortized. Other intangibles with definite lives are amortized on a straight-line basis over their estimated economic lives. Goodwill and indefinite lived intangible assets are reviewed annually during the fourth quarter for impairment (See Note 2 “Summary of Significant Accounting Policies” included herein). Goodwill and indefinite live intangible assets were not impaired at December 31, 2017 and 2016.
The change in the carrying amount of goodwill by segment for the year ended December 31, 2017 is as follows:
 
 
Freight
 
Transit
 
 
In thousands
 
Segment
 
Segment
 
Total
Balance at December 31, 2016
 
$
550,902

 
$
1,527,863

 
$
2,078,765

Additions
 
152,096

 
34,391

 
186,487

Foreign currency impact
 
15,960

 
178,891

 
194,851

Balance at December 31, 2017
 
$
718,958

 
$
1,741,145

 
$
2,460,103



As of December 31, 2017 and 2016, the Company’s trade names had a net carrying amount of $603.4 million and $510.5 million, respectively, and the Company believes these intangibles have indefinite lives. Intangible assets of the Company, other than goodwill and trade names, consist of the following:
 
 
December 31,
In thousands
 
2017
 
2016
Patents, non-compete and other intangibles, net of accumulated
 
 
 
 
amortization of $43,021 and $40,638
 
$
17,554

 
$
15,360

Customer relationships, net of accumulated amortization
 
 
 
 
of $126,824 and $87,334
 
583,459

 
528,068

Total
 
$
601,013

 
$
543,428



The remaining weighted average useful lives of patents, customer relationships and intellectual property were 10 years, 17 years and 15 years respectively. Amortization expense for intangible assets was $36.5 million, $22.7 million, and $21.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.
Estimated amortization expense for the five succeeding years is as follows (in thousands):
2018
$
38,059

2019
36,076

2020
34,050

2021
33,777

2022
33,489