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Debt (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended
Jan. 31, 2012
Sep. 30, 2012
Property
Sep. 30, 2011
Jun. 30, 2012
Sep. 30, 2012
Loan
Property
Sep. 30, 2011
Dec. 31, 2011
Loan
Jun. 26, 2012
Property
Jun. 15, 2012
Jan. 30, 2012
Property
Sep. 30, 2012
Mortgage loans maturity in 2014 [Member]
Loan
Jun. 15, 2012
Maximum [Member]
Jun. 15, 2012
Minimum [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Dec. 31, 2011
Senior Revolving Credit Agreement [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Federal funds effective rate [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
LIBOR [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Administrative agent's prime rate [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Maximum [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Maximum [Member]
LIBOR [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Minimum [Member]
Sep. 30, 2012
Senior Revolving Credit Agreement [Member]
Minimum [Member]
LIBOR [Member]
Aug. 31, 2012
Senior secured term loan [Member]
Sep. 30, 2012
Mortgage Loans Payable [Member]
Dec. 31, 2011
Mortgage Loans Payable [Member]
Sep. 30, 2012
Mortgage Loans Payable [Member]
Mortgage loans maturity in 2014 [Member]
Debt (Textual) [Abstract]                                                    
Borrowings outstanding under the facility                           $ 51,400,000 $ 41,000,000                      
Outstanding borrowings amount limited on amendment                       100,000,000 80,000,000                          
Maturity date                           Jan. 19, 2015                        
Extension option on maturity date                           12 months                        
Amount repaid of term loan         1,205,000 616,000                                 10,100,000      
Prime, effective and margin rate                               0.50% 2.50% 1.00%   3.50%   2.50%        
Unused facility fee rate                                     0.35%   0.25%          
Number of mortgage loans         8   4       2                              
Mortgage loans payable, value   106,900,000     106,900,000   38,300,000       9,800,000                              
Weighted average fixed annual rate   3.90%     3.90%                                     4.50% 5.40% 5.85%
Mortgage loans maturity, period         between 2014 and 2021           2014                              
Debt (Additional Textual) [Abstract]                                                    
Revolving credit facility   100,000,000     100,000,000                                          
Unused facility fee value   52,000 84,000   175,000 285,000                                        
Revolving credit facility may be increased by approval of the administrative agent                 150,000,000                                  
Percentage of borrowing base properties         60.00%                                          
Amount of borrowing base properties         100,000,000                                          
Senior secured term loan             20,100,000                                      
Non-recourse mortgage loan               39,800,000   20,100,000                                
Fixed annual interest rate on non-recourse mortgage loan               3.65%   3.79%                                
Number of properties secured on non-recourse mortgage loan               3   5                                
Non-recourse mortgage loan maturity date Feb. 05, 2019     Mar. 05, 2020                                            
Total net investment book value of properties securing the debt   $ 211,400,000     $ 211,400,000   $ 84,200,000                                      
Properties under borrowing base   13     13