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Taxes (Tables)
6 Months Ended
Jun. 30, 2012
Taxes [Abstract]  
Summary of provision for (benefit from) income taxes
                                 
    Three Months Ended
June 30,
    Six Months Ended
June 30,
 
    2012     2011     2012     2011  

Interim period provision for income taxes before valuation allowance

  $ 1,653     $ (414 )    $ 3,313     $ 52  

Decrease due to valuation allowance

    (36 )      (9,926 )      (67 )      (9,926 ) 
   

 

 

   

 

 

   

 

 

   

 

 

 

Provision for (benefit from) income taxes

  $ 1,617     $ (10,340 )    $ 3,246     $ (9,874 )