Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Capital Stock (Details)

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Shareholders' Equity - Capital Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 25, 2014
Jun. 24, 2014
Jun. 13, 2014
Dec. 31, 2013
Jun. 30, 2014
Series A Preferred Stock
Jun. 30, 2014
Series A Preferred Stock
Aug. 05, 2014
Series A Preferred Stock
Subsequent Event
Class of Stock [Line Items]                
At the market preferred stock, shares authorized       3,000,000        
At the market shares sold           1,531,733 2,141,219 1,306,741
Common stock, shares authorized 800,000,000 800,000,000 600,000,000   600,000,000      
Proceeds from Issuance of public offering           $ 34,142 $ 48,112 $ 29,266
Offering expenses           820 1,101 586
Dividends paid           $ 3,710 $ 6,935  
Dividends paid per share on monthly basis           $ 0.1667