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Equity (Details 3) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Interest Expense
Sep. 30, 2013
Interest Expense
Sep. 30, 2014
Other Income
Sep. 30, 2013
Other Income
Accumulated Other Comprehensive Loss                
Accumulated other comprehensive loss     $ 17,173,157 $ 25,237,253        
Net unrealized losses on derivatives designated as cash flow hedges     17,500,000 26,300,000        
Unrealized gain related to available-for-sale securities     400,000 1,100,000        
Net realized losses on derivatives designated as cash flow hedges         (9,614,701) (10,564,021)    
Net realized gain on sale of available-for-sale investments             431,476 100,000
Income attributable to noncontrolling interest 100,000 100,000            
Distributions attributable to noncontrolling interest $ 1,100,000 $ 1,100,000