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Stockholders' Equity (DRIP) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Feb. 28, 2018
Class of Stock [Line Items]        
Common stock, shares authorized (in shares) 375,000,000   375,000,000  
Net proceeds $ 2,606 $ 54,084    
DRIP        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)       6,000,000
Shares of common stock (in shares) 31,430 33,246    
Net proceeds $ 1,293 $ 1,321