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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized to grant 3,800,000  
Stock-based compensation $ 32,119 $ 27,072
Contributions to the Profit Sharing Plan 3,400 400
Incentive Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 29,700 $ 23,900
Restricted Stock Units, PRSUs, and Restricted Stock Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total number of stock awards outstanding 15,400,000  
Unvested stock awards outstanding 13,300,000  
Performance-based Restricted Stock Units [Member] | One to Four Years [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of earned award vested 80.00%  
Performance-based Restricted Stock Units [Member] | Fifth Year [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of earned award vested 20.00%  
Restricted Stock Units and Restricted Stock Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense related to non-vested options $ 485,400  
Weighted-average period, compensation cost expected to recognized, in years 2 years 10 months 24 days  
SWAP Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Elective deferrals vested percentage 100.00%  
Percentage of earnings deferred into company stock units 5.00%  
Percentage of earnings deferred into company stock units, Company match 25.00%  
Percentage of earnings deferred into company stock units, Additional elective deferral 1.00%  
Minimum [Member] | Deferred Compensation Plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 1 year  
Minimum [Member] | Deferred Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 1 year  
Minimum [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 1 year  
Minimum [Member] | Performance-based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential percentage of converted shares 0.00%  
Minimum [Member] | Restricted Stock Award [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 1 year  
Minimum [Member] | SWAP Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 1 year  
Maximum [Member] | Deferred Compensation Plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 8 years  
Maximum [Member] | Deferred Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 10 years  
Maximum [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 10 years  
Maximum [Member] | Performance-based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential percentage of converted shares 200.00%  
Maximum [Member] | Restricted Stock Award [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 5 years  
Maximum [Member] | SWAP Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period in years 10 years