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Equity (Details 3) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Accumulated Other Comprehensive Loss      
Net unrealized losses on derivatives designated as cash flow hedges, net of deferred losses on terminated interest swaps $ 7,500,000   $ 13,900,000
Deferred losses on terminated interest swaps (900,000)   (1,100,000)
Unrealized gain related to available-for-sale securities 800,000   $ 300,000
Interest Expense      
Accumulated Other Comprehensive Loss      
Net realized losses on derivatives designated as cash flow hedges (3,241,500) $ (6,555,041)  
Loss on Termination of Swaps      
Accumulated Other Comprehensive Loss      
Net realized losses on derivatives designated as cash flow hedges $ (4,285,995)    
Other Income | Residential mortgage-backed security (RMBS)      
Accumulated Other Comprehensive Loss      
Net realized gain on sale of available-for-sale investments   $ 431,476