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Share Capital, textual 1 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Class of Stock [Line Items]        
Treasury shares 113,076     (0)
Common Stock        
Class of Stock [Line Items]        
Number of shares to be repurchased 2,000,000      
Preferred Stock        
Class of Stock [Line Items]        
Repurchase program amount       $ 20,000
Series B cumulative redeemable perpetual preferred shares        
Class of Stock [Line Items]        
Repurchased shares 109,397      
Private Placement | Common Stock        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 2,727,272   1,000,000  
Private Placement | Series B cumulative redeemable perpetual preferred shares        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues     800,000  
June 2013 public offering        
Class of Stock [Line Items]        
Preferred Stock, Discount On Shares     $ 672  
Payments of Stock Issuance Costs     463  
Proceeds on issuance of preferred stock, net     $ 38,865  
June 2013 public offering | Series B cumulative redeemable perpetual preferred shares        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues     800,000  
Share Price     $ 25  
Preferred Shares, Dividend Rate Percentage     8.00%  
Preferred Shares, Per Share Amounts Of Preferred Dividends In Arrears     $ 2  
Preferred Shares, Redemption Date     Jun. 30, 2016  
Preferred Shares, Redemption Price Per Share     $ 25  
Preferred Shares Conditions For Dividend Rate Increase If the Company fails to comply with certain covenants as these terms are defined in the applicable agreement, defaults on any of its credit facilities, fails to pay four quarterly dividends payable in arrears or if the Series B preferred shares are not redeemed at the option of the Company, in whole by July 30, 2018, the dividend rate payable on the Series B preferred shares increases quarterly to a rate that is 1.25 times the dividend rate payable on the series B preferred shares , subject to an aggregate maximum rate per annum of 25% prior to July 30, 2016 and 30% thereafter.      
November 2013 public offering        
Class of Stock [Line Items]        
Common Stock, Discount on Shares     $ 1,898  
Payments of Stock Issuance Costs     275  
Proceeds on issuance of common stock, net     $ 47,980  
November 2013 public offering | Common Stock        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues     5,750,000  
Share Price     $ 7.43  
May 2014 public offering        
Class of Stock [Line Items]        
Preferred Stock, Discount On Shares   $ 1,744    
Payments of Stock Issuance Costs   252    
Proceeds on issuance of preferred stock, net   $ 55,504    
May 2014 public offering | Series C cumulative redeemable perpetual preferred shares        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues   2,300,000    
Share Price   $ 25    
Preferred Shares, Dividend Rate Percentage   8.00%    
Preferred Shares, Per Share Amounts Of Preferred Dividends In Arrears   $ 2    
Preferred Shares, Redemption Date   May 31, 2019    
Preferred Shares, Redemption Price Per Share   $ 25    
June 2014 public offering        
Class of Stock [Line Items]        
Preferred Stock, Discount On Shares   $ 2,369    
Payments of Stock Issuance Costs   211    
Proceeds on issuance of preferred stock, net   $ 77,420    
June 2014 public offering | Series D cumulative redeemable perpetual preferred shares        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues   3,200,000    
Share Price   $ 25    
Preferred Shares, Dividend Rate Percentage   8.00%    
Preferred Shares, Per Share Amounts Of Preferred Dividends In Arrears   $ 2    
Preferred Shares, Redemption Date   Jun. 30, 2019    
Preferred Shares, Redemption Price Per Share   $ 25    
December 2016 public offering        
Class of Stock [Line Items]        
Common Stock, Discount on Shares $ 710      
Payments of Stock Issuance Costs 379      
Proceeds on issuance of common stock, net $ 17,204      
December 2016 public offering | Common Stock        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 15,640,000      
Share Price $ 1.1