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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Federal $ 0 $ 0 $ 0 $ 271
State 0 0 0 46
Tax expense (benefit) $ 0 $ 0 $ 0 $ 317
TRS        
Income Tax Contingency [Line Items]        
Percentage of voting interests of gross deferred tax asset     100.00%