Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

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Stockholder's Equity (Details) - USD ($)
 3 Months Ended
Apr. 18, 2017
Jan. 27, 2015
Mar. 31, 2017
Dec. 31, 2016
Feb. 18, 2016
Class of Stock [Line Items]          
Shares of common stock offered (in shares)     11,893,146 11,886,216  
Aggregate offering price of shelf registration         $ 600,000,000
Reinvestment of dividends paid to common stockholders     $ 247,333    
Depositary Shares [Member]          
Class of Stock [Line Items]          
Percent equivalent of preferred shares     1.00%    
Preferred Stock [Member] | Series A Cumulative Redeemable Preferred Stock [Member]          
Class of Stock [Line Items]          
Coupon rate percentage   7.375% 7.375%    
Underwritten Public Offering [Member] | Depositary Shares [Member]          
Class of Stock [Line Items]          
Shares sold in offering (in shares)   2,250,000      
Dividend Reinvestment Plan [Member]          
Class of Stock [Line Items]          
Reinvestment of distributions to stockholders (in shares)     41,511    
Reinvestment of dividends paid to common stockholders     $ 1,100,000    
Shelf registration after dividend reinvestment plan reduction     $ 598,900,000    
Subsequent Event [Member] | Underwritten Public Offering [Member] | Depositary Shares [Member]          
Class of Stock [Line Items]          
Shares sold in offering (in shares) 2,800,000        
Subsequent Event [Member] | Dividend Reinvestment Plan [Member]          
Class of Stock [Line Items]          
Reinvestment of dividends paid to common stockholders $ 70,000,000