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Intangible Assets
 6 Months Ended
Jun. 30, 2011
Intangible Assets [Abstract]  
Intangible Assets
6. Intangible Assets
The following table details intangible assets at the end of each period:
                 
    As of  
    June 30,     December 31,  
    2011     2010  
    (in thousands)  
Contract and customer relationships
  $ 19,923     $ 14,942  
Less: Accumulated amortization
    10,221       8,994  
 
           
 
    9,702       5,948  
 
           
 
               
Non-compete agreements
    2,038       2,038  
Less: Accumulated amortization
    1,876       1,807  
 
           
 
    162       231  
 
           
 
               
Intangible assets, net
  $ 9,864     $ 6,179  
 
           
Amortization expense for the three months ended June 30, 2011 and 2010 was $0.8 million and $0.6 million, respectively. Amortization expense for the six months ended June 30, 2011 and 2010 was $1.3 million and $1.2 million, respectively.