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Intangibles
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles
INTANGIBLES
The change in the carrying amount of goodwill by segment for the nine months ended September 30, 2018 is as follows:
In thousands
Freight
Segment
 
Transit
Segment
 
Total
Balance at December 31, 2017
$
718,958

 
$
1,741,145

 
$
2,460,103

Additions
5,252

 
13,707

 
18,959

Foreign currency impact
(7,710
)
 
(58,798
)
 
(66,508
)
Balance at September 30, 2018
$
716,500

 
$
1,696,054

 
$
2,412,554


As of September 30, 2018, and December 31, 2017, the Company’s trade names had a net carrying amount of $599.5 million and $603.4 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:
In thousands
September 30,
2018
 
December 31,
2017
Patents, non-compete and other intangibles, net of accumulated
 
 
 
amortization of $42,928 and $43,021
$
15,192

 
$
17,554

Customer relationships, net of accumulated amortization
 
 
 
of $151,007 and $126,824
542,780

 
583,459

Total
$
557,972

 
$
601,013


The weighted average remaining useful life of patents, customer relationships and other intangibles are 10 years, 16 years and 14 years, respectively. Amortization expense for intangible assets was $9.9 million and $30.1 million for the three and nine months ended September 30, 2018, and $8.6 million and $27.0 million for the three and nine months ended September 30, 2017, respectively.
Amortization expense for the five succeeding years is estimated to be as follows:
Remainder of 2018
$
10,460

2019
38,335

2020
36,099

2021
35,608

2022
35,320