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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%