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Intangibles
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles
INTANGIBLES
The change in the carrying amount of goodwill by segment for the three months ended March 31, 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
9,938

 
14,482

 
24,420

Foreign currency impact
1,402

 
42,894

 
44,296

Balance at March 31, 2018
$
730,298

 
$
1,798,521

 
$
2,528,819


As of March 31, 2018 and December 31, 2017, the Company’s trade names had a net carrying amount of $629.1 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
March 31,
2018
 
December 31,
2017
Patents, non-compete and other intangibles, net of accumulated
 
 
 
amortization of $43,122 and $43,021
$
17,651

 
$
17,554

Customer relationships, net of accumulated amortization
 
 
 
of $137,308 and $126,824
584,968

 
583,459

Total
$
602,619

 
$
601,013


The weighted average remaining useful life of patents, customer relationships and other intangibles were 10 years, 17 years and 15 years, respectively. Amortization expense for intangible assets was $10.4 million for the three months ended March 31, 2018, and $9.0 million for the three months ended March 31, 2017, respectively.

Amortization expense for the five succeeding years is estimated to be as follows:
Remainder of 2018
$
31,031

2019
39,094

2020
36,829

2021
36,059

2022
35,771