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Preferred Stock (Tables)
 6 Months Ended
Jun. 30, 2013
Preferred Stock [Abstract]  
Preferred Dividend Stock Period Annualized
         
    DIVIDEND PERIOD ANNUALIZED   ANNUALIZED DIVIDEND RATE
     BEGINNING   ENDING
       August 11, 2011       December 31, 2011       5.0 % 
       January 1, 2012       December 31, 2013       1.0% to 5.0 % 
       January 1, 2014       February 7, 2016       1.0% to 7.0 %(1) 
       February 8, 2016       Redemption       9.0 %(2) 
  (1) Between January 1, 2014 and February 7, 2016, the dividend rate will be fixed at a rate in such range based upon the level of percentage change in QSBL between September 30, 2013 and the Baseline.
  (2) Beginning on February 8, 2016, the dividend rate will be fixed at nine percent (9%) per annum.