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Stockholders’ Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 13, 2017 USD ($) $ / shares | Oct. 31, 2019 USD ($) $ / shares shares | Oct. 31, 2017 shares | Dec. 31, 2019 USD ($) director quarter $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares | Nov. 27, 2019 shares | Mar. 28, 2019 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 200,000,000 | 200,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 20,872,888 | 12,000,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 20,872,888 | 12,000,000 |  |  |
Liquidation preference (USD per share) | $ / shares |  |  |  | $ 25 |  |  |  |
Preferred stock, redemption price per share (USD per share) | $ / shares |  |  |  | 25.00 |  |  |  |
Common stock dividend per share (in dollars per share) | $ / shares |  |  |  | $ 0.80 | $ 0.80 | $ 0.80 |  |
Preferred stock issuance proceeds, net | $ |  |  |  | $ 215,073 | $ 0 | $ 130,496 |  |
Ordinary Income |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock dividend per share (in dollars per share) | $ / shares |  |  |  | $ 0.42 | $ 0.37 | $ 0.46 |  |
Capital Gain Distribution |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock dividend per share (in dollars per share) | $ / shares |  |  |  | 0.13 | 0.12 | 0.17 |  |
Return of Capital |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock dividend per share (in dollars per share) | $ / shares |  |  |  | $ 0.25 | $ 0.31 | $ 0.17 |  |
Preferred Equity Distribution Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock issuance proceeds, net | $ |  |  |  | $ 48,400 |  |  |  |
Preferred stock, available for future issuance | $ |  |  |  | $ 82,400 |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 3,156,087 | 3,000,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 3,156,087 | 3,000,000 |  |  |
Preferred stock, dividend rate (as a percent) |  |  |  | 7.75% | 7.75% |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 4,181,807 | 3,600,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 4,181,807 | 3,600,000 |  |  |
Preferred stock, dividend rate (as a percent) |  |  |  | 7.875% | 7.875% |  |  |
Preferred stock, shares subscribed but unissued (in shares) |  |  |  |  |  |  |  | 2,460,000
Series D Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 6,123,495 | 5,400,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 6,123,495 | 5,400,000 |  |  |
Preferred stock, dividend rate (as a percent) |  |  |  | 8.00% | 8.00% |  |  |
Liquidation preference (USD per share) | $ / shares |  |  |  | $ 25 |  |  |  |
Proceeds from sale of stock | $ | $ 130,500 |  |  |  |  |  |  |
Preferred stock, shares subscribed but unissued (in shares) |  |  |  |  |  |  |  | 2,650,000
Series D Preferred Stock | Underwritten Public Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued in transaction (in shares) |  |  | 5,400,000 |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 7,411,499 |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 7,411,499 |  |  |  |
Preferred stock, dividend rate (as a percent) |  |  |  | 7.875% |  |  |  |
Preferred stock, shares subscribed but unissued (in shares) |  |  |  |  |  |  | 3,000,000 |
Series E Preferred Stock | Underwritten Public Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued in transaction (in shares) |  | 6,900,000 |  |  |  |  |  |
Liquidation preference (USD per share) | $ / shares |  | $ 25 |  |  |  |  |  |
Proceeds from sale of stock | $ |  | $ 166,700 |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 30,900,000 | 30,900,000 |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 20,872,888 | 12,000,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 20,872,888 | 12,000,000 |  |  |
Minimum number of quarters without dividends that result in voting rights | quarter |  |  |  | 6 |  |  |  |
Number of additional directors elected | director |  |  |  | 2 |  |  |  |

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