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Earnings Per Share and Equity Transactions - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
May 01, 2019 | Aug. 15, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tender Offer Event [Line Items] |  |  |  |  |
Stock repurchase program, discount percentage | 25.00% |  |  |  |
Distribution reinvestment plan, discount percent | 25.00% |  |  |  |
Common stock, par value (usd per share) |  |  | $ 0.001 | $ 0.001 |
Repurchase of common stock |  |  | $ 5,201,000 | $ 20,384,000 | $ 98,491,000
Common Stock |  |  |  |  |
Tender Offer Event [Line Items] |  |  |  |  |
Purchase price (usd per share) | $ 3.14 |  |  | $ 2.355 |
Repurchase of common stock (in shares) |  |  | 2,136,119 | 8,517,605 | 46,559,289
Issuance of common stock under dividend reinvestment plan (in shares) |  |  | 79,040 |  |
Price per share(usd per share) |  |  | $ 2.355 |  |
Repurchase of common stock |  |  | $ 2,000 | $ 9,000 | $ 45,000
Dutch Auction |  |  |  |  |
Tender Offer Event [Line Items] |  |  |  |  |
Purchase price (usd per share) |  | $ 2.10 |  |  |
Authorized repurchase amount |  | $ 75,000,000 |  |  |
Common stock, par value (usd per share) |  | $ 0.001 |  |  |
Outstanding shares, percent |  | 2.00% |  |  |
Increase in shares authorized to be repurchased (in shares) |  | 10,706,774 |  |  |
Increase in authorized amount |  | $ 22,500,000 |  |  |
Cost of stock repurchased |  | 97,775,000 |  |  |
Repurchase of common stock |  | $ 98,491,000 |  |  |
Dutch Auction | Common Stock |  |  |  |  |
Tender Offer Event [Line Items] |  |  |  |  |
Repurchase of common stock (in shares) |  | 46,559,289 |  |  |
Percentage of outstanding stock |  | 6.00% |  |  |

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