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Common Stock (Details Textual) - USD ($)
 1 Months Ended 6 Months Ended
May 06, 2015
May 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Class of Stock [Line Items]        
Proceeds From Issuance Of Common Stock   $ 109,700,000 $ 112,077,131 $ 13,607,946
Stock Issued During Period, Shares, New Issues   2,875,000    
ATM Program [Member]        
Class of Stock [Line Items]        
Proceeds From Issuance Of Common Stock     2,700,000  
Gross Amount Remaining To Be Issued     $ 57,400,000  
Common Stock Average Price     $ 38.44 $ 30.59
Common Stock [Member] | ATM Program [Member]        
Class of Stock [Line Items]        
Proceeds From Issuance Of Common Stock       $ 13,900,000
Value Of Equity Instruments To Be Issued $ 100,000,000      
Stock Issued During Period, Shares, New Issues     69,042 454,514