Intangible Assets
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Dec. 31, 2013
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Intangible Assets | Note 9—Intangible Assets
At December 31, 2013 and 2012, intangible assets totaled $45,303 and $51,978, respectively, net of amortization. The table below summarizes the intangible asset categories, amounts and the average amortization periods which are generally on a straight-line basis, at December 31:
Amortization expense of intangible assets was $7,467, $6,543 and $9,699 for the years ended December 31, 2013, 2012 and 2011, respectively. Estimated amortization expense for intangible assets as of December 31, 2013 is as follows:
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