v3.21.2

Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 40 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 13, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 4,600,000 |  |  |  | 4,600,000 |  | 4,600,000 |  | 4,600,000 |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 6.75% | 6.75% |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 4,600,000 |  |  |  | 4,600,000 |  | 4,600,000 |  | 4,600,000 |
Preferred Stock, Shares Authorized |  | 100,000,000 |  |  |  | 100,000,000 |  | 100,000,000 |  | 100,000,000 |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.001 |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 |  |  |  | $ 25.00 |  | $ 25.00 |  |  |
Preferred Stock, Amount of Preferred Dividends in Arrears |  |  |  |  | $ 1,300 | $ 1,300 |  |  |  |  |
Preferred Stock Dividend Rate Variable Rate Spread |  |  |  |  |  | 5.196% |  |  |  |  |
Common stock, shares authorized (in shares) |  | 100,000,000 |  |  |  | 100,000,000 |  | 100,000,000 |  | 100,000,000 |
Common Stock, Par or Stated Value Per Share |  | $ 0.001 |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Dividends declared (in usd per share) |  | $ 0.45 | $ 0.27 |  |  | $ 1.19 | $ 0.97 |  |  |  |
Dividends paid |  |  |  |  |  | $ (58,469) | $ (50,642) |  |  |  |
Common shares issued and outstanding upon conversion of all convertible securities (in shares) |  | 52,366,399 |  |  |  | 52,366,399 |  | 52,366,399 | 44,442,631 |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  |  | 1,550,000
Shares repurchased (in shares) |  | 0 | 1,878 |  |  | 0 | 290,050 | 701,965 |  |  |
Average price per share (USD per share) |  |  | $ 11.00 |  |  |  | $ 10.54 | $ 13.36 |  |  |
Total cost |  |  | $ (21) | $ (3,035) |  |  | $ (3,100) | $ (9,400) |  |  |
Stock Issued During Period, Shares, New Issues | 5,290,000 | 7,852,900 | 0 |  |  | 7,852,900 | 5,290,000 |  |  |  |
Proceeds from issuance of shares, net | $ 95,300 |  |  |  |  |  |  |  |  |  |
Shares Issued As Payment of Incentive Fee, Shares |  | 37,373 | 0 |  |  | 37,373 | 637 |  |  |  |
Maximum shares available to be issued under at the market program |  |  |  |  |  | 10,000,000 |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 690,000 |  |  |  |  |  |  |  |  |  |
At-the-market program |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 1,549,900 |  |  |  | 1,549,900 |  |  |  |  |
Proceeds from issuance of shares, net |  | $ 28,200 |  |  |  | $ 28,200 |  |  |  |  |
Agent commissions |  | $ 400 |  |  |  | $ 400 |  |  |  |  |
Operating Partnership Units [Member] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, conversion of units |  | 5,710 | 3,638 |  |  | 5,710 | 133,154 |  |  |  |

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