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Subsequent Events (Details) - Distributions - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Nov. 01, 2018
Oct. 01, 2018
Nov. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]          
Distribution rate       $ 0.50 $ 0.50
Distributions reinvested       $ 32,691 $ 36,171
Net cash distribution       $ 61,125 $ 56,226
Subsequent Event | Dividend Declared          
Subsequent Event [Line Items]          
Distribution rate $ 0.05583344 $ 0.05583344 $ 0.05583344    
Subsequent Event | Dividend Paid          
Subsequent Event [Line Items]          
Gross amount of distribution paid $ 12,701 $ 12,691      
Distributions reinvested 3,787 3,817      
Net cash distribution $ 8,914 $ 8,874