Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Preferred Stock, Shares Authorized   10,000   10,000
Preferred Stock, Par or Stated Value Per Share   $ 0.001   $ 0.001
Preferred Stock, Shares Issued   3,105   3,105
Common Stock, Shares Authorized   500,000   500,000
Common Stock, Par or Stated Value Per Share   $ 0.001   $ 0.001
Common Stock, Shares, Outstanding   21,631   21,631
Dividends Payable   $ 5,940   $ 5,638
Preferred Stock, Liquidation Preference Per Share   $ 25    
Payments of Ordinary Dividends, Preferred Stock and Preference Stock $ 0 $ 2,911 $ 0  
Limited Partners' Capital Account, Units Issued   1,857   1,246
Payments of dividens, Common Stock, OP and LTIP Units   $ (9,288) (7,208)  
Partners' Capital Account, Units, Sale of Units   611   1,246
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   $ 4,742   $ 11,532
Limited Partners' Capital Account   16,274   $ 11,532
Common Stock [Member]        
Dividends Payable $ 96 113 96  
Payments of Ordinary Dividends   45 $ 0  
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   $ 0    
Series A Preferred Stock [Member]        
Preferred Stock, Shares Issued   3,105   3,105
Dividends Payable, Amount Per Share   $ 1,875    
Preferred Stock, Liquidation Preference Per Share   $ 25    
Preferred Stock, Dividend Rate, Percentage   7.50%    
Long Tem Incentives Plan Units [Member]        
Dividends Payable   $ 184   $ 116