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Stockholders' Equity (DRIP) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 28, 2018
Class of Stock [Line Items]        
Common stock, shares authorized (in shares) 375,000,000   375,000,000  
Net proceeds $ 65,440 $ 539,318    
DRIP        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)       10,000,000
Shares of common stock (in shares) 121,988 309,127    
Net proceeds $ 4,458 $ 16,481