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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets, Gross [Abstract]    
Net operating loss $ 0 $ 0
Deferred income 0 0
Basis difference on investment in unconsolidated entities 27,916 73,228
Depreciation expense 0 0
Miscellaneous 0 0
Total deferred tax assets 27,916 73,228
Less: Valuation allowance (27,916) (73,228)
Net deferred tax assets 0 0
Deferred tax liabilities $ 0 $ 0