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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Jul. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) director quarter seriesOfPreferredStock $ / shares shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Dec. 31, 2020 $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Sep. 30, 2021 USD ($) director quarter seriesOfPreferredStock $ / shares shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 $ / shares shares | Aug. 10, 2021 USD ($) $ / shares | Nov. 27, 2019 USD ($) | Mar. 29, 2019 USD ($) | Aug. 10, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 30,900,000 |  |  |  |  |  | 30,900,000 |  |  |  |
Number of series of cumulative redeemable preferred stock outstanding | seriesOfPreferredStock |  | 4 |  |  |  |  |  |  | 4 |  |  |  |  |  |
Redemption price (in dollars per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |
Common stock issuance, net | $ |  |  |  |  |  |  |  |  |  | $ 511,906 |  |  |  |  |
Net income attributable to company's common stockholders | $ |  | $ (394) |  |  |  | $ 1,764 |  |  | $ (3,428) | $ 704 |  |  |  |  |
Preferred stock redemption period |  |  |  |  |  |  |  |  | 120 days |  |  |  |  |  |
Number of elected directors pending preferred stock voting rights | director |  | 2 |  |  |  |  |  |  | 2 |  |  |  |  |  |
Percent of outstanding shares affirmative votes needed for material and adverse changes to preferred stock terms |  |  |  |  |  |  |  |  | 66.67% |  |  |  |  |  |
Cash dividend per share (in dollars per share) | $ / shares |  | $ 0.100 | $ 0.100 | $ 0.100 | $ 0.100 | $ 0.075 | $ 0.050 | $ 0 |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  |
Equity Distribution Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |
Common stock that may be sold (up to) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Common stock reserved for issuance | $ |  | $ 100,000 |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  | $ 72,500
Shares issued (in shares) |  | 0 |  |  |  | 0 |  |  | 0 | 0 |  |  |  |  |
Equity agreement for preferred stock maximum aggregate sales price (up to) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 149,100 | $ 131,500 |  |
Preferred Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 0 |  |  |  | 0 |  |  | 0 | 0 |  |  |  |  |
Equity agreement for preferred stock maximum aggregate sales price (up to) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |
Preferred stock available for future issuance, value | $ |  | $ 100,000 |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 6,000,000 |  |  | 6,000,000 |  |  |  | 6,000,000 |  | 6,000,000 |  |  |  |
Preferred stock, shares issued (in shares) |  | 3,156,087 |  |  | 3,156,087 |  |  |  | 3,156,087 |  | 3,156,087 |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  |  | 7.75% |  | 7.75% |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 8,400,000 |  |  | 8,400,000 |  |  |  | 8,400,000 |  | 8,400,000 |  |  |  |
Preferred stock, shares issued (in shares) |  | 6,123,495 |  |  | 6,123,495 |  |  |  | 6,123,495 |  | 6,123,495 |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  |  | 8.00% |  | 8.00% |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 2,000,000 | 9,900,000 |  |  | 9,900,000 |  |  |  | 9,900,000 |  | 9,900,000 |  |  |  |
Preferred stock, shares issued (in shares) |  | 7,411,499 |  |  | 7,411,499 |  |  |  | 7,411,499 |  | 7,411,499 |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  |  |  |  |  |  | 7.875% |  | 7.875% |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 5,750,000 | 7,750,000 |  |  |  |  |  |  | 7,750,000 |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 5,750,000 |  |  |  |  |  |  | 5,750,000 |  |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate | 6.875% |  |  |  |  |  |  |  | 6.875% |  |  |  |  |  |
Redemption price (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series F Preferred Stock | Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issuance, net | $ | $ 138,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  | $ 25 |  |  |  |  |  |  | $ 25 |  |  |  |  |  |
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% |  | 7.875% |  |  |  |
Redemption price (in dollars per share) | $ / shares | $ 25.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  | $ 25.00 |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |
Net income attributable to company's common stockholders | $ |  | $ (3,400) |  |  |  |  |  |  | $ (3,400) |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 200,000,000 |  |  | 200,000,000 |  |  |  | 200,000,000 |  | 200,000,000 |  |  |  |
Preferred stock, par value (in usd per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 22,441,081 |  |  | 20,872,888 |  |  |  | 22,441,081 |  | 20,872,888 |  |  |  |
Preferred stock, shares issued (in shares) |  | 22,441,081 |  |  | 20,872,888 |  |  |  | 22,441,081 |  | 20,872,888 |  |  |  |
Number of quarters with no dividends that results in voting rights | quarter |  | 6 |  |  |  |  |  |  | 6 |  |  |  |  |  |

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