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Preferred Stock (Details)
 3 Months Ended
Mar. 31, 2013
Term 1 [Member]
  
Preferred Stock [Line Items]  
Annualized Dividend Rate 5.00%
Term 4 [Member]
  
Preferred Stock [Line Items]  
Annualized Dividend Rate 9.00%
Minimum [Member] | Term 1 [Member]
  
Preferred Stock [Line Items]  
Dividend Annualized Period Aug. 11, 2011
Minimum [Member] | Term 2 [Member]
  
Preferred Stock [Line Items]  
Annualized Dividend Rate 1.00%
Dividend Annualized Period Jan. 02, 2012
Minimum [Member] | Term 3 [Member]
  
Preferred Stock [Line Items]  
Annualized Dividend Rate 1.00% [1]
Dividend Annualized Period Jan. 01, 2014
Minimum [Member] | Term 4 [Member]
  
Preferred Stock [Line Items]  
Dividend Annualized Period Feb. 08, 2016
Maximum [Member] | Term 1 [Member]
  
Preferred Stock [Line Items]  
Dividend Annualized Period Dec. 31, 2011
Maximum [Member] | Term 2 [Member]
  
Preferred Stock [Line Items]  
Annualized Dividend Rate 5.00%
Dividend Annualized Period Dec. 31, 2013
Maximum [Member] | Term 3 [Member]
  
Preferred Stock [Line Items]  
Annualized Dividend Rate 7.00% [1]
Dividend Annualized Period Feb. 07, 2016
[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.