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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized to grant |  |  | 3,600,000 |
Stock-based compensation |  |  | $ 54,443 | $ 47,642
Contributions to the Profit Sharing Plan | $ 3,000 | $ 6,300 | 6,400 | 6,700
Incentive Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | $ 34,100 | $ 26,900 | $ 63,800 | $ 50,800
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 | 15,600,000 |  | 15,600,000 |
Unvested stock awards outstanding | 13,500,000 |  | 13,500,000 |
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 | $ 467,400 |  | $ 467,400 |
Weighted-average period, compensation cost expected to recognized, in years |  |  | 2 years 9 months 18 days |
SWAP Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Elective deferrals vested percentage | 100.00% |  | 100.00% |
Percentage of earnings deferred into company stock units | 5.00% |  | 5.00% |
Percentage of earnings deferred into company stock units, Company match | 25.00% |  | 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 |

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