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Income Taxes - Schedule of components of distributions made to common stockholders on a per share basis (Details) - $ / shares
 12 Months Ended
Nov. 12, 2015
Oct. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dividends, dollars per share            
Ordinary income (in dollars per share)     $ 1.91 $ 1.98 $ 0.94  
Capital gains (in dollars per share)     0.05 0.51 3.24  
Unrecaptured Section 1250 gain (in dollars per share)     0.00 0.38 0.36  
Return of capital (in dollars per share)     1.01 0.00 0.00  
Dividends paid for income tax purposes (in dollars per share)     $ 2.97 $ 2.87 $ 4.54  
Dividends, percent            
Ordinary income (as a percent)     64.30% 69.00% 20.80%  
Capital gains (as a percent)     1.70% 17.80% 71.40%  
Unrecaptured Section 1250 gain (as a percent)     0.00% 13.20% 7.80%  
Return of capital (as a percent)     34.00% 0.00% 0.00%  
Dividends paid (as a percent)     100.00% 100.00% 100.00%  
Dividends declared for common stock (in dollars per share) $ 2.00 $ 2.00 $ 2.97 $ 2.87 $ 2.75  
Cash deemed paid (in dollars per share)           $ 0.21