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Summary of Significant Accounting Policies, Share-Based Compensation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Jun. 30, 2018
shares
Share-based Compensation expenses [Abstract]      
Share-based compensation $ 29,940 $ 0  
Common stock, shares outstanding (in shares) | shares 24,957,309    
Discount for Lack of Marketability [Member]      
Share-based Compensation expenses [Abstract]      
Valuation assumptions 0.34    
Volatility [Member]      
Share-based Compensation expenses [Abstract]      
Valuation assumptions 0.9    
Weighted Average Cost of Capital [Member]      
Share-based Compensation expenses [Abstract]      
Valuation assumptions 0.275    
Nonvoting Common Stock [Member]      
Share-based Compensation expenses [Abstract]      
Share-based compensation [1] $ 27,298    
Fair market value of non-voting shares at shares granted date 19,123    
Withholding taxes on share-based compensation $ 8,175    
Number of common shares issued (in shares) | shares 4,922,353    
Common stock, shares outstanding (in shares) | shares 4,922,353   4,922,353
[1] Non-Voting Common Share Issuance