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Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 15, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Common stock dividends |  | $ 303,164 | $ 277,120 | $ 257,007
Common stock dividends (in dollars per share) |  | $ 1.95 | $ 1.86 | $ 1.78
Common stock dividends declared and paid (in dollars per share) |  | 1.95 | 1.86 | 1.78
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends declared and paid (in dollars per share) | $ 0.500 |  |  |
Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | $ 1.3 | $ 1.3 | $ 0.231111
Preferred stock dividends declared and paid |  | $ 17,940 | $ 17,940 | $ 3,189
Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | $ 1.425 | $ 1.425 | $ 1.425
Preferred stock dividends declared and paid |  | $ 16,387 | $ 16,387 | $ 16,387
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  |  | $ 0.312847 | $ 1.65625
Preferred stock dividends declared and paid |  | $ 0 | $ 3,598 | $ 19,047
Ordinary dividends |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | $ 1.658604 | $ 1.559781 | $ 1.513705
Ordinary dividends | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 1.25582 | 1.261789 | 0.231111
Ordinary dividends | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 1.376571 | 1.383115 | 1.425000
Ordinary dividends | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  |  | 0.303652 | 1.656250
Capital gain |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | 0.015534 | 0.035041 | 0
Capital gain | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0.011761 | 0.028345 | 0
Capital gain | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0.012892 | 0.031071 | 0
Capital gain | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  |  | 0.006821 | 0
Unrecaptured Section 1250 Gain |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | 0.042818 | 0.012194 | 0
Unrecaptured Section 1250 Gain | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0.032419 | 0.009866 | 0
Unrecaptured Section 1250 Gain | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0.035537 | 0.010814 | 0
Unrecaptured Section 1250 Gain | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  |  | 0.002374 | 0
Nontaxable distributions |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | $ 0.233044 | $ 0.252984 | $ 0.266295

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