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Income Taxes Composition of Tax Distributions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Ordinary income 28.60% 28.20%
Return of capital 70.90% 71.80%
Capital gain distributions 0.50% 0.00%
Total 100.00% 100.00%