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Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 15, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Common stock dividends |  | $ 333,692 | $ 303,164 | $ 277,120
Common stock dividends (in dollars per share) |  | $ 2.030 | $ 1.950 | $ 1.860000
Common stock dividends declared and paid (in dollars per share) |  | $ 2.03 | $ 1.95 | $ 1.86
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends declared and paid (in dollars per share) | $ 0.515 |  |  |
Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid |  | $ 17,940 | $ 17,940 | $ 17,940
Preferred stock dividends declared and paid (in dollars per share) |  | $ 1.300000 | $ 1.300000 | $ 1.300000
Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid |  | $ 13,201 | $ 16,387 | $ 16,387
Preferred stock dividends declared and paid (in dollars per share) |  | $ 1.147917 | $ 1.425000 | $ 1.425000
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid |  | $ 0 | $ 0 | $ 3,598
Preferred stock dividends declared and paid (in dollars per share) |  |  |  | $ 0.312847
Ordinary dividends |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | $ 1.762899 | $ 1.658604 | 1.559781
Ordinary dividends | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 1.300000 | 1.255820 | 1.261789
Ordinary dividends | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 1.147917 | 1.376571 | 1.383115
Ordinary dividends | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  |  |  | 0.303652
Capital gain |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | 0 | 0.015534 | 0.035041
Capital gain | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0 | 0.011761 | 0.028345
Capital gain | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0 | 0.012892 | 0.031071
Capital gain | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  |  |  | 0.006821
Unrecaptured Section 1250 Gain |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | 0 | 0.042818 | 0.012194
Unrecaptured Section 1250 Gain | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0 | 0.032419 | 0.009866
Unrecaptured Section 1250 Gain | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared and paid (in dollars per share) |  | 0 | 0.035537 | 0.010814
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
Nontaxable distributions |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends (in dollars per share) |  | $ 0.267101 | $ 0.233044 | $ 0.252984

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