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Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Real estate investment trust required distribution (percent) 90.00%  
Valuation allowance $ 27,351,000 $ 27,916,000
Deferred tax assets 0  
Unrecognized tax benefits $ 0