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Variable Interest Entities (Tables)
3 Months Ended
Mar. 31, 2013
Variable Interest Entities [Abstract]  
Carrying amount of the investments in the VIEs
                 
    March 31,
2013
    December 31,
2012
 

Investments

  $ 2,293     $ 2,225  

Maximum exposure to losses

    2,293       2,225