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Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 16, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |
Dividends |  | $ 277,120 | $ 257,007 | $ 228,699
Common stock dividends paid, Per share (in USD per share) |  | $ 1.86 | $ 1.78 | $ 1.71
Dividends declared (in dollars per share) |  | 1.86 | 1.78 | $ 1.71
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends declared (in dollars per share) | $ 0.475 |  |  |
Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | $ 1.3 | $ 0.231111 |
Dividends declared and paid |  | $ 17,940 | $ 3,189 | $ 0
Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | $ 1.425 | $ 1.425 | $ 1.425
Dividends declared and paid |  | $ 16,387 | $ 16,387 | $ 16,387
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | $ 0.312847 | $ 1.65625 | $ 1.65625
Dividends declared and paid |  | $ 3,598 | $ 19,047 | $ 19,047
Ordinary dividends |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends paid, Per share (in USD per share) |  | $ 1.559781 | $ 1.513705 | $ 1.363294
Ordinary dividends | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 1.261789 | 0.231111 |
Ordinary dividends | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 1.383115 | 1.425000 | 1.385670
Ordinary dividends | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.303652 | 1.656250 | 1.610538
Qualified dividends |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends paid, Per share (in USD per share) |  | 0 | 0 | 0.019005
Qualified dividends | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0 | 0 |
Qualified dividends | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0 | 0 | 0.020141
Qualified dividends | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0 | 0 | 0.023409
Capital gain |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends paid, Per share (in USD per share) |  | 0.035041 | 0 | 0.007806
Capital gain | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.028345 | 0 |
Capital gain | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.031071 | 0 | 0.007937
Capital gain | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.006821 | 0 | 0.009225
Unrecaptured Section 1250 Gain |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends paid, Per share (in USD per share) |  | 0.012194 | 0 | 0.011055
Unrecaptured Section 1250 Gain | Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.009866 | 0 |
Unrecaptured Section 1250 Gain | Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.010814 | 0 | 0.011252
Unrecaptured Section 1250 Gain | Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends paid per share (in USD per share) |  | 0.002374 | 0 | 0.013078
Nontaxable distributions |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividends paid, Per share (in USD per share) |  | $ 0.252984 | $ 0.266295 | $ 0.308840

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