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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Feb. 28, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  | 375,000,000 |  | 375,000,000 |  | 375,000,000 |
Net proceeds |  |  |  | $ 174,499 | $ 277,076 |  |
Total shares issued (in shares) |  | 151,627,386 |  | 151,627,386 |  | 147,149,945 |
Stock issuance costs |  |  |  | $ 2,618 | 4,266 |  |
Common stock dividends |  | $ 70,670 | $ 66,676 | $ 205,110 | $ 190,277 |  |
Common stock per share (in dollars per share) |  | $ 0.475 | $ 0.455 | $ 1.385 | $ 1.325 |  |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) | $ 0.475 |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends |  | $ 0 | $ 4,762 | $ 3,598 | $ 14,285 |  |
Per depository share (in dollars per share) |  | $ 0 | $ 0.414063 | $ 0.3128472 | $ 1.242188 |  |
Series E Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends |  | $ 4,097 | $ 4,097 | $ 12,291 | $ 12,291 |  |
Per depository share (in dollars per share) |  | $ 0.356250 | $ 0.356250 | $ 1.068750 | $ 1.068750 |  |
Series F Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends |  | $ 4,485 | $ 0 | $ 13,455 | $ 0 |  |
Per depository share (in dollars per share) |  | $ 0.325 | $ 0 | $ 0.975 | $ 0 |  |
DRIP |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  |  |  |  |  |  | 16,000,000
Shares of common stock (in shares) |  |  |  | 135,721 | 164,640 |  |
Net proceeds |  |  |  | $ 5,469 | $ 7,376 |  |
2016 ATM |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  | 12,000,000 |  | 12,000,000 |  |  |
Total shares issued (in shares) |  | 8,192,542 |  | 8,192,542 |  |  |
2015 ATM |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total allowable shares (in shares) |  | 10,000,000 |  | 10,000,000 |  |  |
Total shares issued (in shares) |  | 9,852,465 |  | 9,852,465 |  |  |
ATM Equity Programs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares of common stock (in shares) |  |  |  | 3,969,252 | 5,716,222 |  |
Average price per share (net) (in dollars per share) |  |  |  | $ 42.00 | $ 46.48 |  |
Net proceeds |  |  |  | $ 166,698 | $ 265,696 |  |
Stock issuance costs |  |  |  | $ 2,563 | $ 4,266 |  |

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