Annual report pursuant to Section 13 and 15(d)

Stockholder's Equity (Details)

v3.3.1.900
Stockholder's Equity (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 27, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 18, 2016
Sep. 30, 2015
Jun. 23, 2015
Jan. 23, 2015
Class of Stock [Line Items]                  
Preferred stock, authorized     10,000,000 0          
Preferred stock, par value     $ 0.001 $ 0          
Preferred stock, issued     22,500 0          
Net offering proceeds $ 54,200,000                
Series A Cumulative Redeemable Preferred Stock, value of stock issed     $ 56,250,000 $ 0          
Shares of common stock offered     11,939,697 9,321,010       2,587,500  
Shelf Registration Statement Aggregate Offering Price     $ 106,600,000           $ 300,000,000.0
Reinvestment of distributions by common stockholders in additional common shares       $ 140,108 $ 108,119        
Series A Cumulative Redeemable Preferred Stock [Member]                  
Class of Stock [Line Items]                  
Preferred stock, issued 22,500                
Depositary Shares [Member]                  
Class of Stock [Line Items]                  
Annual dividend, per share $ 1.84375                
Preferred Stock [Member] | Series A Cumulative Redeemable Preferred Stock [Member]                  
Class of Stock [Line Items]                  
Coupon rate 7.375%   7.375%            
Common Stock [Member]                  
Class of Stock [Line Items]                  
Shares sold in offering     2,587,500 4,485,000          
Authorized amount of shares to be repurchased     $ 10,000,000            
Reinvestment of distributions to stockholders, shares         3,099        
Underwritten Public Offering [Member] | Depositary Shares [Member]                  
Class of Stock [Line Items]                  
Shares sold in offering 2,250,000                
Liquidation preference, per share $ 25.00                
Dividend Reinvestment Plan [Member]                  
Class of Stock [Line Items]                  
Reinvestment of distributions by common stockholders in additional common shares     $ 817,915 $ 140,108          
Dividend Reinvestment Plan [Member] | Common Stock [Member]                  
Class of Stock [Line Items]                  
Reinvestment of distributions to stockholders, shares     28,510 3,973          
Purchase of GIGS, Common Stock Offering [Member]                  
Class of Stock [Line Items]                  
Number of shares in offering (in shares)   2,587,500              
Reinvestment of distributions by common stockholders in additional common shares   $ 77,600,000              
Purchase of GIGS, Convertible Debt Offering [Member]                  
Class of Stock [Line Items]                  
Reinvestment of distributions by common stockholders in additional common shares   $ 115,000,000              
CORRPrA [Member]                  
Class of Stock [Line Items]                  
Series A Cumulative Redeemable Preferred Stock, value of stock issed             $ 23    
Subsequent Event [Member]                  
Class of Stock [Line Items]                  
Shelf Registration Statement Aggregate Offering Price           $ 600,000,000