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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Intangible assets          
Total $ 42,345   $ 42,345   $ 45,303
Amortization expense of intangible assets 1,843 1,891 3,687 3,685  
Estimated future amortization expense for intangible assets          
2014 (remaining six months) 4,177   4,177    
2015 6,164   6,164    
2016 5,694   5,694    
2017 5,508   5,508    
2018 5,307   5,307    
Thereafter 15,495   15,495    
Tradename
          
Intangible assets          
Total 19,217   19,217   21,023
Tradename | Minimum
          
Intangible assets          
Amortization Period     3 years    
Tradename | Maximum
          
Intangible assets          
Amortization Period     10 years    
Non-compete agreements
          
Intangible assets          
Total 1,662   1,662   2,575
Non-compete agreements | Minimum
          
Intangible assets          
Amortization Period     2 years    
Non-compete agreements | Maximum
          
Intangible assets          
Amortization Period     5 years    
Customer relationship
          
Intangible assets          
Total $ 21,466   $ 21,466   $ 21,705
Customer relationship | Minimum
          
Intangible assets          
Amortization Period     3 years    
Customer relationship | Maximum
          
Intangible assets          
Amortization Period     15 years