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Liabilities - Mortgage Payable (Details) - Mortgage Payable - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Long-term debt    
Mortgage payable outstanding $ 1.0 $ 1.2
Interest rate (as a percent) 7.91%  
Level 3    
Long-term debt    
Fair value of debt instrument $ 1.0 $ 1.2