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Goodwill and Intangible Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill impairment     $ 942
Goodwill, Impaired, Accumulated Impairment Loss 24,845    
Weighted Average Amortization Period 6 years    
Finite Lived Intangible Assets Amortization Expenses $ 26,878 $ 22,510 $ 17,631
Customer Relationships [Member]
      
Weighted Average Amortization Period 5 years    
Other Intangible Assets [Member]
      
Weighted Average Amortization Period 7 years