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Organization and Summary of Significant Accounting Policies - Share-based Compensation Plans (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Feb. 26, 2016
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Illiquidity rate 9.20%  
Post exercise holding period 2 years 6 months  
Service Based Restricted Stock Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration Period 10 years  
Performance Based Restricted Stock Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration Period 10 years  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration Period 10 years  
Minimum | Service Based Restricted Stock Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Minimum | Performance Based Restricted Stock Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 1 year  
Maximum | Service Based Restricted Stock Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Maximum | Performance Based Restricted Stock Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
2016 Stock Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future grants (in shares)   1.0
Shares available for future grants (in shares) 1.7