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Goodwill and Intangible Assets (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Goodwill, Impairment Loss |  |  | $ 942
Weighted Average Amortization Period | 6 years |  |
Goodwill, Impaired, Accumulated Impairment Loss | 24,845 |  |
Finite Lived Intangible Assets Amortization Expenses | $ 26,575 | $ 21,997 | $ 17,631
Customer Relationships [Member] |  |  |
Weighted Average Amortization Period | 5 years |  |
Other Intangible Assets [Member] |  |  |
Weighted Average Amortization Period | 7 years |  |

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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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