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Equity - Schedule of Share Redemptions (Details) - Common Stock - Share Redemption Program - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Class of Stock [Line Items]        
Stock redeemed during period (in shares) 0 6,700,875 0 6,701,939
Weighted average price per share (in dollars per share) $ 0.00 $ 9.59 $ 0.00 $ 9.59