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Equity - Dividends (Details) - $ / shares
 12 Months Ended
Dec. 18, 2017
Sep. 19, 2017
Jun. 20, 2017
Mar. 30, 2017
Dec. 31, 2017
Class of Stock [Line Items]          
Common stock, distributions per share (in dollars per share) $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 1
Common stock, dividends         100.00%
Common stock, percentage classified as ordinary dividends         58.532%
Common stock, percentage classified as capital gain distribution         16.09%
Common stock, percentage classified as return of capital         25.38%
Common stock, capital gain distribution, unrecaptured 1250 gain         $ 0.0300
Oridnary Dividends          
Class of Stock [Line Items]          
Common stock, distributions per share (in dollars per share) 0.14633 0.14633 0.14633 0.14633 0.58532
Non-Qualified Ordinary Dividends          
Class of Stock [Line Items]          
Common stock, distributions per share (in dollars per share) 0.14633 0.14633 0.14633 0.14633 0.58532
Qualified Ordinary Dividends          
Class of Stock [Line Items]          
Common stock, distributions per share (in dollars per share) 0 0 0 0 0
Capital Gain Distributions          
Class of Stock [Line Items]          
Common stock, distributions per share (in dollars per share) 0.04023 0.04023 0.04023 0.04023 0.16092
Return of Capital Dividend          
Class of Stock [Line Items]          
Common stock, distributions per share (in dollars per share) $ 0.06345 $ 0.06345 $ 0.06345 $ 0.06345 $ 0.2538