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Intangible Assets | 12 Months Ended
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Dec. 31, 2012
Intangible Assets |
Intangible Assets | Note 9—Intangible Assets At December 31, 2012 and 2011, intangible assets totaled $51,978 and $32,021, respectively, net of amortization. The December 31, 2012 balance includes the effect of four acquisitions during 2012 (See Note 4). 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 |  |  |  | Amount |
|  | Period |  |  |  | 2012 |  | 2011 |
Tradename |  | 3 and 10 years |  |  |  | $ | 23,586 |  | $ | 18,791 |
Non-compete agreements |  | 2 to 5 years |  |  |  | 4,130 |  | 4,695 |
Customer relationships |  | 5 to 15 years |  |  |  | 24,212 |  | 8,181 |
Backlog |  | 0.75 years |  |  |  | 50 |  | 354 |
|  |  |  | Total |  | $ | 51,978 |  | $ | 32,021 |
Amortization expense of intangible assets was $6,543, $9,699 and $6,580 for the years ended December 31, 2012, 2011 and 2010, respectively. Estimated amortization expense for intangible assets as of December 31, 2012 is as follows:
For the Years Ending December 31, |  | Estimated Intangible Amortization Expense |
2013 |  | $ | 7,020 |
2014 |  | 6,986 |
2015 |  | 5,834 |
2016 |  | 5,330 |
2017 |  | 5,318 |
Thereafter |  | 21,490 |
|  | $ | 51,978 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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