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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Ownership interest 16.86% 49.30%
Gross deferred tax assets, valuation allowance $ 10,546 $ 11,361
Internal Revenue Code [Member]    
Gross deferred tax assets, valuation allowance $ 2,400 $ 29,800