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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Approximate minimum annual rentals under operating lease obligations and sublease receivables
      September 30,       September 30,  
    Operating
Lease
Obligations
    Sublease
Receivables
 

2012

  $ 5,248     $ 779  

2013

    2,441       215  

2014

    1,512       —    

2015

    1,016       —    

2016

    986       —    

Thereafter

    645       —    
   

 

 

   

 

 

 

Total

  $ 11,848     $ 994