Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Details)

v3.10.0.1
Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Details) - $ / shares
9 Months Ended
Sep. 30, 2018
Dec. 26, 2018
Dec. 20, 2018
Nov. 20, 2018
Oct. 23, 2018
Oct. 19, 2018
Oct. 09, 2018
Series A Preferred Stock | Subsequent event              
Subsequent Event [Line Items]              
Distributions per share             $ 0.3984375
Series A Preferred Stock | Period One              
Subsequent Event [Line Items]              
Record Date Oct. 19, 2018            
Payment Date Oct. 31, 2018            
Series A Preferred Stock | Period One | Subsequent event              
Subsequent Event [Line Items]              
Distributions per share           $ 0.1328125  
Series A Preferred Stock | Period Two              
Subsequent Event [Line Items]              
Record Date Nov. 20, 2018            
Payment Date Nov. 30, 2018            
Series A Preferred Stock | Period Three              
Subsequent Event [Line Items]              
Record Date Dec. 20, 2018            
Payment Date Dec. 31, 2018            
Series B Preferred Stock | Subsequent event              
Subsequent Event [Line Items]              
Distributions per share             0.375
Series B Preferred Stock | Period One              
Subsequent Event [Line Items]              
Record Date Oct. 23, 2018            
Payment Date Oct. 31, 2018            
Series B Preferred Stock | Period One | Subsequent event              
Subsequent Event [Line Items]              
Distributions per share         $ 0.125    
Series B Preferred Stock | Period Two              
Subsequent Event [Line Items]              
Record Date Nov. 20, 2018            
Payment Date Nov. 30, 2018            
Series B Preferred Stock | Period Three              
Subsequent Event [Line Items]              
Record Date Dec. 26, 2018            
Payment Date Jan. 03, 2019            
Common Stock | Subsequent event              
Subsequent Event [Line Items]              
Distributions per share             $ 0.1332
Common Stock | Period One              
Subsequent Event [Line Items]              
Record Date Oct. 19, 2018            
Payment Date Oct. 31, 2018            
Common Stock | Period One | Subsequent event              
Subsequent Event [Line Items]              
Distributions per share           $ 0.0444  
Common Stock | Period Two              
Subsequent Event [Line Items]              
Record Date Nov. 20, 2018            
Payment Date Nov. 30, 2018            
Common Stock | Period Three              
Subsequent Event [Line Items]              
Record Date Dec. 20, 2018            
Payment Date Dec. 31, 2018            
Forecast | Series A Preferred Stock | Period Two              
Subsequent Event [Line Items]              
Distributions per share       $ 0.1328125      
Forecast | Series A Preferred Stock | Period Three              
Subsequent Event [Line Items]              
Distributions per share     $ 0.1328125        
Forecast | Series B Preferred Stock | Period Two              
Subsequent Event [Line Items]              
Distributions per share       0.125      
Forecast | Series B Preferred Stock | Period Three              
Subsequent Event [Line Items]              
Distributions per share   $ 0.125          
Forecast | Common Stock | Period Two              
Subsequent Event [Line Items]              
Distributions per share       $ 0.0444      
Forecast | Common Stock | Period Three              
Subsequent Event [Line Items]              
Distributions per share     $ 0.0444