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Secured Debt and Credit Facilities, Other Notes Payable (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Aug. 09, 2010
Nichols
Apr. 30, 2012
Nichols Promissory Note
Mar. 31, 2012
Nichols Promissory Note
Aug. 09, 2010
Nichols Promissory Note
Notes payables              
Nichols promissory note issued       $ 6.7      
Interest rate             7.50%
Outstanding principal balance under the Nichols Promissory Note 4.7   4.7     4.7  
Repayment of promissory note 0 0.3     0.4    
Nichols promissory note, current           $ 1.3