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Stockholders' Equity (DRIP) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Feb. 28, 2021
Dec. 31, 2020
Class of Stock [Line Items]        
Common stock, shares authorized (in shares) 375,000,000     375,000,000
Net proceeds $ 3,325 $ 65,440    
DRIP        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)     6,000,000  
Shares of common stock (in shares) 46,666 121,988    
Net proceeds $ 2,012 $ 4,458