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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) quarter director seriesOfPreferredStock $ / shares shares | Jun. 30, 2021 shares | Jun. 30, 2022 USD ($) quarter director seriesOfPreferredStock $ / shares shares | Jun. 30, 2021 shares | Dec. 31, 2021 $ / shares shares | Feb. 28, 2022 USD ($) | Aug. 10, 2021 USD ($) $ / shares | Nov. 27, 2019 USD ($) | Mar. 29, 2019 USD ($) | Aug. 10, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of series of cumulative redeemable preferred stock outstanding | seriesOfPreferredStock | 4 |  | 4 |  |  |  |  |  |  |
Redemption price (in dollars per share) | $ / shares | $ 25.00 |  | $ 25.00 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 800,000,000 |  | 800,000,000 |  | 800,000,000 |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
Common stock, shares, issued (in shares) | 378,647,371 |  | 378,647,371 |  | 379,405,240 |  |  |  |  |
Common stock, shares outstanding (in shares) | 378,647,371 |  | 378,647,371 |  | 379,405,240 |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  | $ 200,000 |  |  |  |
Shares repurchased (in shares) | 2,794,824 |  | 2,794,824 |  |  |  |  |  |  |
Common stock repurchases | $ | $ 7,541 |  | $ 7,541 |  |  |  |  |  |  |
Fees and commissions paid | $ | $ 30 |  | $ 30 |  |  |  |  |  |  |
Average cost per share (in usd per share) | $ / shares | $ 2.69 |  | $ 2.69 |  |  |  |  |  |  |
Remaining authorized repurchase amount | $ | $ 192,500 |  | $ 192,500 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |
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 usd per share) | $ / shares | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |  |  |
Preferred stock, shares issued (in shares) | 22,284,994 |  | 22,284,994 |  | 22,284,994 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 22,284,994 |  | 22,284,994 |  | 22,284,994 |  |  |  |  |
Number of quarters with no dividends that results in voting rights | quarter | 6 |  | 6 |  |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 8,400,000 |  | 8,400,000 |  | 8,400,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 6,123,495 |  | 6,123,495 |  | 6,123,495 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 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) | 9,900,000 |  | 9,900,000 |  | 9,900,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 7,411,499 |  | 7,411,499 |  | 7,411,499 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 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) | 7,750,000 |  | 7,750,000 |  | 7,750,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 5,750,000 |  | 5,750,000 |  | 5,750,000 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 5,750,000 |  | 5,750,000 |  | 5,750,000 |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  | 6.875% |  | 6.875% |  |  |  |  |
Series G Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 5,450,000 |  | 5,450,000 |  | 3,450,000 |  |  |  |  |
Preferred stock, shares issued (in shares) | 3,000,000 |  | 3,000,000 |  | 3,000,000 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 3,000,000 |  | 3,000,000 |  | 3,000,000 |  |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  | 7.00% |  |  |  |  |  |  |

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