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Intangibles
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles
INTANGIBLES
The change in the carrying amount of goodwill by segment for the three months ended months ended March 31, 2017 is as follows:
In thousands
Freight
Segment
 
Transit
Segment
 
Total
Balance at December 31, 2016
$
550,902

 
$
1,527,863

 
$
2,078,765

Adjustment to preliminary purchase allocation
2,260

 
48,687

 
50,947

Acquisitions
35,165

 

 
35,165

Foreign currency impact
3,343

 
20,283

 
23,626

Balance at March 31, 2017
$
591,670

 
$
1,596,833

 
$
2,188,503


As of March 31, 2017 and December 31, 2016, the Company’s trade names had a net carrying amount of $525.7 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:
In thousands
March 31,
2017
 
December 31,
2016
Patents, non-compete and other intangibles, net of accumulated
 
 
 
amortization of $43,280 and $42,538
$
13,071

 
$
15,360

Customer relationships, net of accumulated amortization
 
 
 
of $95,984 and $87,334
550,317

 
528,068

Total
$
563,388

 
$
543,428


The weighted average remaining useful life of patents, customer relationships and other intangibles were 10 years, 18 years and 16 years, respectively. Amortization expense for intangible assets was $9.0 million and $5.3 million for the three months ended March 31, 2017, and 2016, respectively.
Amortization expense for the five succeeding years is estimated to be as follows:
Remainder of 2017
$
25,308

2018
33,328

2019
32,284

2020
30,762

2021
30,774