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INTANGIBLES
12 Months Ended
Dec. 31, 2016
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, 2016 and 2015.
The change in the carrying amount of goodwill by segment for the year ended December 31, 2016 is as follows:
 
 
Freight
 
Transit
 
 
In thousands
 
Segment
 
Segment
 
Total
Balance at December 31, 2015
 
$
531,965

 
$
326,567

 
$
858,532

Adjustment to preliminary purchase allocation
 
1,186

 
755

 
1,941

Acquisitions
 
30,262

 
1,212,354

 
1,242,616

Foreign currency impact
 
(12,511
)
 
(11,813
)
 
(24,324
)
Balance at December 31, 2016
 
$
550,902

 
$
1,527,863

 
$
2,078,765



As of December 31, 2016 and 2015, the Company’s trade names had a net carrying amount of $510.5 million and $167.4 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:
 
 
December 31,
In thousands
 
2016
 
2015
Patents, non-compete and other intangibles, net of accumulated
 
 
 
 
amortization of $42,538 and $40,936
 
$
15,360

 
$
11,403

Customer relationships, net of accumulated amortization
 
 
 
 
of $87,334 and $70,493
 
528,068

 
261,751

Total
 
$
543,428

 
$
273,154



The remaining weighted average useful lives of patents, customer relationships and intellectual property were 10 years, 16 years and 16 years respectively. Amortization expense for intangible assets was $22.7 million, $21.7 million, and $22.4 million for the years ended December 31, 2016, 2015, and 2014, respectively.
Estimated amortization expense for the five succeeding years is as follows (in thousands):
2017
$
34,613

2018
33,582

2019
32,549

2020
31,028

2021
30,774