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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract]    
Basis difference on investment in unconsolidated entities $ 27,351 $ 27,916
Total deferred tax assets 27,351 27,916
Less: Valuation allowance (27,351) (27,916)
Net deferred tax assets 0 0
Deferred tax liabilities $ 0 $ 0