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Variable Interest Entity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 27, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Variable Interest Entity [Line Items]          
Impairment charge on equity method investment     $ 1,535 $ 0  
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Equity investments and advances to affiliates $ 1,800        
Ownership percentage 16.50%        
VIE loss, our portion   $ 100      
Impairment charge on equity method investment     1,500    
Investment in VIE   $ 200 $ 200   $ 1,700