OTHER INTANGIBLE ASSETS, NET
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Dec. 31, 2012
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OTHER INTANGIBLE ASSETS, NET | 9. OTHER INTANGIBLE ASSETS, NET Intangible assets are generally the result of acquisitions and consist primarily of purchased technology, customer related intangibles, and trademarks. Intangible assets are amortized over useful lives that range between 1 and 20 years. The following table summarizes the intangible assets acquired (including their weighted-average useful lives) by the Corporation during 2012 and 2011. No indefinite lived intangible assets were purchased in 2012 or 2011.
The following tables present the cumulative composition of the Corporation's acquired intangible assets as of December 31:
Amortization expense for the years ended December 31, 2012, 2011, and 2010 was $31.1 million, $28.8 million, and $26.0 million, respectively. The estimated future amortization expense of purchased intangible assets is as follows:
Included in other intangible assets at December 31, 2012 and 2011, are $9.9 million of intangible assets not subject to amortization. The Corporation completed its annual test of impairment of indefinite lived intangible assets during the fourth quarter of 2012, 2011, and 2010, and concluded there was no impairment of value. |