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| Goodwill and Intangible Assets [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill and Intangible Assets |
Goodwill The Company’s Heavy Duty Diesel Systems reporting unit, which is also a reporting segment, has all of the Company’s allocated goodwill. The changes in the carrying amount of goodwill for the nine months ended September 30, 2011 is as follows (in thousands):
Intangible Assets Intangible assets as of September 30, 2011 and December 31, 2010 are summarized as follows (in thousands):
The Company recorded amortization expense of $0.2 million and $0.1 million related to amortizable intangible assets during the three months ended September 30, 2011 and 2010, respectively. The Company recorded amortization expense of $0.7 million and $0.4 million related to amortizable intangible assets during the nine months ended September 30, 2011 and 2010, respectively. Estimated amortization expense for existing intangible assets for each of the next five years is as follows (in thousands):
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