Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v3.10.0.1
Subsequent Events (Details) - $ / shares
 3 Months Ended 9 Months Ended
Oct. 24, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]          
Dividends declared per share (in dollars per share)   $ 0.750 $ 0.750 $ 2.250 $ 2.25
Common Stock [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Dividends declared per share (in dollars per share) $ 0.75        
Series A Cumulative Redeemable Preferred Stock [Member]          
Subsequent Event [Line Items]          
Coupon rate percentage       7.375%  
Series A Cumulative Redeemable Preferred Stock [Member] | Depositary Shares [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Depositary stock, dividends declared per share (in dollars per share) $ 0.4609375        
Series A Cumulative Redeemable Preferred Stock [Member] | Preferred Stock [Member]          
Subsequent Event [Line Items]          
Coupon rate percentage       7.375%