Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Capital Stock (Details)

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Shareholders' Equity - Capital Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
May. 02, 2015
Jun. 30, 2015
Jun. 30, 2015
May. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]          
Preferred stock, shares authorized   25,000,000 25,000,000   25,000,000
Series A Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, shares authorized   17,290,000 17,290,000   14,290,000
At the market shares sold 129,803 409,073 3,362,012    
Proceeds from Issuance of public offering   $ 9,959 $ 80,882    
Offering expenses $ 138 286 1,732    
Proceeds from at market preferred stock $ 3,214        
Dividends paid   $ 7,152 $ 13,484    
Dividends paid per share on monthly basis     $ 0.1667    
Series A Preferred Stock | Amendment Company's Articles of Incorporation [Member]          
Class of Stock [Line Items]          
Preferred stock, shares authorized       3,000,000