Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Capital Stock) (Details)

v3.3.1.900
Shareholders' Equity (Capital Stock) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May. 31, 2013
May. 24, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 31, 2015
Jun. 24, 2013
May. 21, 2013
Class of Stock [Line Items]                
Preferred stock, par value     $ 0.0001 $ 0.0001        
Common stock, shares authorized     800,000,000 800,000,000 600,000,000      
At the market preferred stock, shares authorized           12,000,000    
Preferred stock, dividends, per share, cash paid, monthly     $ 0.1667          
Series A Preferred Stock                
Class of Stock [Line Items]                
Preferred stock, shares outstanding, designated       6,000,000   3,000,000 3,000,000 5,290,000
Preferred stock, par value     $ 0.0001 $ 0.0001       $ 0.0001
Preferred stock, dividend rate   8.00% 8.00% 8.00%        
Preferred stock, liquidation preference   $ 25.00         $ 25.00  
Preferred stock, liquidation preference per month   $ 2.00            
Redemption period   120 days            
Preferred stock issued during period   4,600,000            
Additional paid in capital   $ 115,000            
Additional new shares issues 690,000              
Additional proceeds from public offering $ 17,250              
Proceeds from Issuance of public offering 132,250              
Offering expenses 5,972   $ 1,972 $ 2,531 $ 411      
At the market shares sold     3,586,790 4,906,734 899,497      
Proceeds from at the market preferred stock     $ 86,352 $ 111,148 $ 22,062      
Dividends paid     $ 28,108 $ 17,244 $ 6,911      
Series A Preferred Stock | Employee brokerage commission expenses                
Class of Stock [Line Items]                
Offering expenses $ 2,603