Debt - Schedule of Debt Maturities (Footnote) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]          
Capitalized interest [1]   $ 412     $ 1,206
CMBS | CMBS Loans          
Debt Instrument [Line Items]          
Debt default amount $ 9,600 9,600 $ 9,600 $ 9,600  
Capitalized interest   $ 2,900      
Revolving Credit Facility          
Debt Instrument [Line Items]          
Extension option, term 1 year        
Discontinued Operations, Disposed of by Sale | CMBS Loans          
Debt Instrument [Line Items]          
Number of loans in default     1 1  
[1] Accrued and overdue interest on certain CMBS notes that have been intentionally placed in default.