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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) quarter $ / shares shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Sep. 30, 2020 USD ($) quarter $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Nov. 27, 2019 USD ($) | Mar. 29, 2019 USD ($) | Sep. 10, 2018 USD ($) | Aug. 10, 2017 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 200,000,000 |  |  | 200,000,000 |  |  |  | 200,000,000 |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |
Preferred stock, shares issued (in shares) | 20,872,888 |  |  | 20,872,888 |  |  |  | 20,872,888 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 20,872,888 |  |  | 20,872,888 |  |  |  | 20,872,888 |  |  |  |  |
Redemption price (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
Preferred stock redemption period |  |  |  |  |  |  |  | 120 days |  |  |  |  |
Number of quarters with no dividends that results in voting rights | quarter | 6 |  |  |  |  |  |  | 6 |  |  |  |  |
Number of elected directors pending preferred stock voting rights | quarter | 2 |  |  |  |  |  |  | 2 |  |  |  |  |
Cash dividend per share (in dollars per share) | $ / shares | $ 0.075 | $ 0.050 | $ 0 | $ 0.200 | $ 0.200 | $ 0.200 | $ 0.200 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |
Net proceeds | $ |  |  |  |  |  |  |  | $ 511,924 | $ 632,248 |  |  |  |
Preferred stock issuance, net | $ |  |  |  |  |  |  |  | $ 0 | $ 30,490 |  |  |  |
Equity Distribution Agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01
Common stock that may be sold (up to) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 177,100 | $ 100,000
Shares Issued (in shares) | 0 |  |  |  |  |  |  | 0 | 2,260,200 |  |  |  |
Price per share (in usd per share) | $ / shares |  |  |  |  | $ 6.12 |  |  |  | $ 6.12 |  |  |  |
Net proceeds | $ |  |  |  |  |  |  |  |  | $ 13,600 |  |  |  |
Common stock reserved for issuance | $ | $ 72,500 |  |  |  |  |  |  | $ 72,500 |  |  |  |  |
Equity agreement for preferred stock maximum aggregate sales price (up to) | $ |  |  |  |  |  |  |  |  |  | $ 131,500 |  |  |
Preferred Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued (in shares) | 0 |  |  |  | 589,420 |  |  | 0 | 1,250,707,000 |  |  |  |
Price per share (in usd per share) | $ / shares |  |  |  |  | $ 24.78 |  |  |  | $ 24.78 |  |  |  |
Net proceeds | $ |  |  |  |  | $ 14,400 |  |  |  |  |  |  |  |
Equity agreement for preferred stock maximum aggregate sales price (up to) | $ |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Preferred stock available for future issuance, value | $ | $ 82,400 |  |  |  |  |  |  | $ 82,400 |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 6,000,000 |  |  |  |  |  |  | 6,000,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 3,156,087 |  |  |  |  |  |  | 3,156,087 |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  | 7.75% |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 6,600,000 |  |  |  |  |  |  | 6,600,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 4,181,807 |  |  |  |  |  |  | 4,181,807 |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  | 7.875% |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 8,400,000 |  |  |  |  |  |  | 8,400,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 6,123,495 |  |  |  |  |  |  | 6,123,495 |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  | 8.00% |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 9,900,000 |  |  |  |  |  |  | 9,900,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 7,411,499 |  |  |  |  |  |  | 7,411,499 |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  | 7.875% |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 30,900,000 |  |  | 30,900,000 |  |  |  | 30,900,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 20,872,888 |  |  | 20,872,888 |  |  |  | 20,872,888 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 20,872,888 |  |  | 20,872,888 |  |  |  | 20,872,888 |  |  |  |  |
Preferred Stock | Preferred Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (in usd per share) | $ / shares |  |  |  |  | $ 24.75 |  |  |  | $ 24.75 |  |  |  |
Preferred stock issuance, net | $ |  |  |  |  |  |  |  |  | $ 30,500 |  |  |  |

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