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Stockholder's Equity (Details 4) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]        
Dividends declared and paid per common share (in USD per share) $ 0.87 $ 0.87 $ 2.6100 $ 2.6100
Common stock cash dividends     $ 971,280 $ 955,631
Total dividends paid     $ 1,006,308 $ 993,365
Series I Preferred Stock        
Class of Stock [Line Items]        
Dividends declared and paid per preferred share (in USD per share)     $ 2.4375 $ 2.4375
Preferred stock cash dividends     $ 35,028 $ 35,035
Series J Preferred Stock        
Class of Stock [Line Items]        
Dividends declared and paid per preferred share (in USD per share)     $ 0 $ 0.2347
Preferred stock cash dividends     $ 0 $ 2,699