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Stockholders' Equity - Dividends (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dividends      
Common stock dividends declared (in dollars per share) $ 0.73 $ 0.68 $ 1.41
Dividends declared (in dollars per share) 4.0800 3.620078 3.41
Operating Partnership Units      
Dividends payable with a combination of cash and stock (in dollars per share)     1.26
Series D Cumulative Redeemable Preferred Stock      
Dividends      
Preferred stock dividends declared (in dollars per share) 0.527778 2.00
Series E Cumulative Redeemable Preferred Stock      
Dividends      
Preferred stock dividends declared (in dollars per share) 1.7375 1.404450  
Series F Cumulative Redeemable Preferred Stock      
Dividends      
Preferred stock dividends declared (in dollars per share) 1.6125 1.00785  
Common Stock      
Dividends      
Common stock dividends declared (in dollars per share) $ 0.7300 $ 0.680000 $ 1.41