5. INTANGIBLES

Goodwill was $728.0 million and $666.0 million at March 31, 2013 and December 31, 2012, respectively.

The change in the carrying amount of goodwill by segment for the three months ended March 31, 2013 is as follows:


In thousands	Freight Segment	Transit Segment	Total

Balance at December 31, 2012	$ 397,184	$ 268,838	$ 666,022
Acquisition	1,482	70,801	72,283
Adjustment to preliminary purchase allocation	-	845	845
Foreign currency impact	(1,759)	(9,370)	(11,129)

Balance at March 31, 2013	$ 396,907	$ 331,114	$ 728,021

As of March 31, 2013 and December 31, 2012, the Company’s trademarks had a net carrying amount of $138.5 million and $131.3 million, respectively, and the Company believes these intangibles have an indefinite life.

Intangible assets of the Company, other than goodwill and trademarks, consist of the following:


In thousands	March 31, 2013	December 31, 2012

Patents and other, net of accumulated amortization of $36,024 and $35,556	$ 12,904	$ 11,835
Customer relationships, net of accumulated amortization of $34,052 and $31,572	173,888	165,160

Total	$ 186,792	$ 176,995

The weighted average remaining useful life of patents, customer relationships and intellectual property were six years, 16 years and 16 years, respectively. Amortization expense for intangible assets was $3.6 million and $3.1 million for the three months ended March 31, 2013 and 2012, respectively.

Amortization expense for the five succeeding years is as follows (in thousands):


Remainder of 2013	$ 12,405
2014	14,826
2015	13,744
2016	13,537
2017	12,016