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Noncontrolling Interests (Tables)
12 Months Ended
Dec. 31, 2011
Noncontrolling Interests [Abstract]  
Summary of redeemable noncontrolling interests
                 
    Income
Statement
Impact
    Redeemable
Noncontrolling
Interests
 

Balance as of December 31, 2008

          $ 4,008  

Noncontrolling interest

  $ 632          

Redemption value change

          632  
   

 

 

         

Formation of noncontrolling interests

            370  

Distribution to noncontrolling interests

            (641
           

 

 

 

Balance as of December 31, 2009

            4,369  

Noncontrolling interest

  $ 757          

Redemption value change

          757  
   

 

 

         

Formation of noncontrolling interests

            1,390  

Distribution to noncontrolling interests

            (717
           

 

 

 

Balance as of December 31, 2010

            5,799  

Noncontrolling interest

  $ 840          

Redemption value change

    716       1,556  
   

 

 

         

Formation of noncontrolling interests

            510  

Distribution to noncontrolling interests

            (901
           

 

 

 

Balance as of December 31, 2011

          $ 6,964