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Common Stock (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
May. 06, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Mar. 27, 2015
Class of Stock [Line Items]          
Stock Issued During Period, Value, New Issues     $ 38,795,073    
Proceeds From Issuance Of Common Stock     $ 38,795,078 $ (14,529)  
ATM Program [Member]          
Class of Stock [Line Items]          
Gross Amount Remaining To Be Issued   $ 60,550,000      
Common Stock Average Price   $ 30.11 $ 30.28    
Common Stock [Member]          
Class of Stock [Line Items]          
Registration Payment Arrangement, Maximum Potential Consideration         $ 500,000,000
Common Stock [Member] | ATM Program [Member]          
Class of Stock [Line Items]          
Stock Issued During Period, Value, New Issues   $ 848,497 $ 1,303,011    
Proceeds From Issuance Of Common Stock   $ 25,550,000 $ 39,450,000    
Value Of Equity Instruments To Be Issued $ 100,000,000