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Contingencies and Commitments (Tables)
12 Months Ended
Dec. 31, 2012
Contingencies and Commitments [Abstract]  
Summary of future minimum lease payments
                                                         
    As of December 31, 2012  
    2013     2014     2015     2016     2017     2018–
2022
    2023 and
beyond
 

Minimum operating lease payments

  $ 2,928     $ 2,587     $ 2,620     $ 2,449     $ 2,412     $ 4,875     $ 0