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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Schedule of future minimum payments under operating leases that have initial or non-cancelable lease terms in excess of one year
         
     Operating
Leases
 
   

2012

  $ 16,501  

2013

    13,092  

2014

    10,963  

2015

    9,983  

2016

    9,336  

Thereafter

    28,354  
   

 

 

 

Total minimum lease payments

  $ 88,229