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Summary of Significant Accounting Policies (Details 1 - Segments)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Feb. 08, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounting Policies [Abstract]              
Number of operating segments | segment         1    
Schedule of Equity Method Investments [Line Items]              
Loss from equity method investment     $ (273) $ 0 $ (273) $ 0  
Equity method investment $ 22,901   $ 22,901   $ 22,901   $ 0
Accu-Trade              
Schedule of Equity Method Investments [Line Items]              
Ownership percent   20.00%          
Cash paid   $ 17,900          
Capital contributions   5,000          
Equity method investment   22,900          
Basis difference   $ 21,000          
Weighted-average life of intangible assets 5 years