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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Feb. 28, 2018
Class of Stock [Line Items] |  |  |  |  |
Total allowable shares (in shares) |  | 375,000,000 |  | 375,000,000 |
Net proceeds |  | $ 696 | $ 5,279 |  |
Total shares issued (in shares) |  | 171,963,354 |  | 171,694,209 |
Common stock dividends |  | $ 88,148 | $ 80,566 |  |
Common stock dividends per share (in dollars per share) |  | $ 0.515 | $ 0.500 |  |
Common stock dividends declared (in dollars per share) |  | $ 0.515 | $ 0.50 |  |
Subsequent event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock dividends declared (in dollars per share) | $ 0.515 |  |  |  |
Series E Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock dividends |  | $ 0 | $ 4,097 |  |
Preferred stock dividends per depositary share (in dollars per share) |  | $ 0 | $ 0.356250 |  |
Dividend rate |  | 5.70% |  |  |
Series F Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock dividends |  | $ 4,485 | $ 4,485 |  |
Preferred stock dividends per depositary share (in dollars per share) |  | $ 0.325000 | $ 0.325000 |  |
Dividend rate |  | 5.20% |  | 5.20% |
DRIP |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total allowable shares (in shares) |  |  |  |  | 10,000,000
Shares of common stock (in shares) |  | 12,528 | 101,180 |  |
Net proceeds |  | $ 696 | $ 5,279 |  |
ATM equity program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total allowable shares (in shares) |  | 12,000,000 |  |  |
Total shares issued (in shares) |  | 9,722,185 |  |  |

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