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Fair Value Accounting - Carrying Values and Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage securities - available-for-sale $ 4,120 $ 3,878
Carrying Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Restricted cash 2,272 2,912
Mortgage securities - available-for-sale 4,120 3,878
Notes payable to related party 4,863 0
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Restricted cash 2,214 2,836
Mortgage securities - available-for-sale 4,120 3,878
Notes payable to related party 3,162 0
Senior Notes [Member] | Carrying Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior notes 81,201 79,654
Senior Notes [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior notes $ 11,267 $ 10,273