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Preferred Stock (Tables)
3 Months Ended
Mar. 31, 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.