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Goodwill and Identifiable Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Customer relationships | Dec. 31, 2012 Customer relationships | Mar. 31, 2013 Customer relationships Minimum | Mar. 31, 2013 Customer relationships Maximum | Mar. 31, 2013 Backlog | Dec. 31, 2012 Backlog | Mar. 31, 2013 Backlog Minimum | Mar. 31, 2013 Backlog Maximum | Mar. 31, 2013 Noncompete agreements | Dec. 31, 2012 Noncompete agreements | Mar. 31, 2013 Noncompete agreements Minimum | Mar. 31, 2013 Noncompete agreements Maximum | Mar. 31, 2013 Tradenames | Dec. 31, 2012 Tradenames | Mar. 31, 2013 Tradenames Minimum | Mar. 31, 2013 Tradenames Maximum
Identifiable Intangible Assets, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Useful Lives in Years |  |  |  |  | 1 year | 15 years |  |  | 1 year | 2 years |  |  | 2 years | 7 years |  |  | 2 years | 25 years
Gross Book Value | $ 73,504 | $ 73,504 | $ 40,404 | $ 40,404 |  |  | $ 6,515 | $ 6,515 |  |  | $ 2,890 | $ 2,890 |  |  | $ 23,695 | $ 23,695 |  |
Accumulated Amortization | $ (30,918) | $ (28,989) | $ (16,934) | $ (15,579) |  |  | $ (6,515) | $ (6,375) |  |  | $ (2,482) | $ (2,380) |  |  | $ (4,987) | $ (4,655) |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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. + Details
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