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Debt (Tables)
9 Months Ended
Sep. 30, 2012
Debt [Abstract]  
Components of debt
                 
    September 30,
2012
    December 31,
2011
 

Revolving credit facility

  $ 410,000     $ 305,000  

Propel facility

    122,351       —    

Senior secured notes

    75,000       75,000  

Capital lease obligations and other

    7,780       8,950  
   

 

 

   

 

 

 
    $ 615,131     $ 388,950