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Stockholders' Equity - Distributions (Details) - $ / shares
1 Months Ended 12 Months Ended 24 Months Ended
Jan. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]      
Daily amount of distribution accrued per share (in dollars per share) $ 0.000924658 $ 0.000924658 $ 0.00184932
Annualized distribution (in dollars per share)   $ 0.3375 $ 0.675