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Stockholders' Equity (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Class of Stock [Line Items]        
Shares Issued, Price Per Share $ 32.29      
Proceeds from Issuance of Common Stock $ 111,000,000      
Common stock, shares authorized 350,000,000 350,000,000    
Preferred stock, shares authorized 50,000,000 50,000,000    
Stock Issued During Period, Shares, New Issues 3,439,636      
Common distributions declared per share $ 1.11 $ 1.0400 $ 0.9400  
Preferred stock, par or state value per share $ 0 0    
Stock issued during period, shares, Distribution Reinvestment and Stock Purchase Plan       9,957,233
Shares reserved for issuance under the Stock Purchase Plan 10,963,730      
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares 112,174      
Equity Distribution Agreement [Member]        
Class of Stock [Line Items]        
Common stock, shares authorized 20,000,000      
Common Stock, Capital Shares Reserved for Future Issuance 13,078,931      
Series E Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, liquidation preference per share $ 16.61      
Number of common stock shares to which each preferred share is convertible after special dividend 1.083      
Declared preferred stock dividend $ 1.33 $ 1.33 $ 1.33  
Preferred stock, shares outstanding 2,796,903 2,803,812    
Series F Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, shares authorized 20,000,000      
Preferred stock, shares outstanding 16,452,496 2,464,183    
Preferred stock, par or state value per share $ 0.0001      
Preferred stock, value, issued $ 1,645 $ 246    
Restricted Stock [Member]        
Class of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 551,293      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 14,691      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period Net of Forfeitures 551,293      
Preferred Stock | Series E Preferred Stock [Member]        
Class of Stock [Line Items]        
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares 0 0 0  
Preferred Stock | Series F Preferred Stock [Member]        
Class of Stock [Line Items]        
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares 0 0 0  
Common Stock        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 6,339,636 3,410,433    
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares 112,174 153,451 76,291  
Common Stock | Series E Preferred Stock [Member]        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 7,480      
Common Stock | Sales [Member]        
Class of Stock [Line Items]        
Shares Issued, Price Per Share $ 35.00      
Proceeds from Issuance of Common Stock $ 101,500,000      
Common Stock | Common Stock        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 2,900,000