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OTHER INTANGIBLE ASSETS, NET
12 Months Ended
Dec. 31, 2012
Other Intangible Assets, Net [Abstract]  
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.

(In thousands, except years data) 2012 2011
  Amount Years Amount Years
Technology $ 46,832 13.9 $ 12,555 10.9
Customer related intangibles   122,047 15.6   36,776 7.5
Other intangible assets   16,641 8.1   5,849 7.1
Total $ 185,520 14.6 $ 55,180 8.2

The following tables present the cumulative composition of the Corporation's acquired intangible assets as of December 31:

(In thousands)      Accumulated   
2012   Gross  Amortization  Net
Technology $ 186,869 $ (76,067) $ 110,802
Customer related intangibles   337,558   (95,880)   241,678
Other intangible assets   86,157   (19,616)   66,541
Total $ 610,584 $ (191,563) $ 419,021
            
(In thousands)      Accumulated   
2011   Gross  Amortization  Net
Technology $ 155,406 $ (65,291) $ 90,115
Customer related intangibles   219,498   (77,945)   141,553
Other intangible assets   44,555   (14,775)   29,780
Total $ 419,459 $ (158,011) $ 261,448

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:

(In thousands)   
2013 $ 45,932
2014   38,739
2015   37,263
2016   36,340
2017   35,902

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.