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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to grant |  |  |  |  |  |  |  |  |  | 5,200,000 |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  | $ 100,789 | $ 140,461 | $ 186,303
Tax benefit related to stock-based compensation |  |  |  |  |  |  |  |  |  | 4,000 |  |
Provision for income tax expense (benefit) |  | $ 41,869 | $ 36,672 | $ 31,060 | $ 30,793 | $ 1,168 | $ 41,603 | $ 30,387 | $ 13,507 | $ 140,394 | 86,665 | 61,062
Restricted stock units, charges at the date of modification |  |  |  |  |  |  |  |  |  |  | 55,900 |
Vesting of outstanding debenture awards | $ 51,400 |  |  |  |  |  |  |  |  |  |  |
Options granted during the period |  |  |  |  |  |  |  |  |  | 0 |  |
Contributions to the Profit Sharing Plan |  |  |  |  |  |  |  |  |  | $ 12,800 | 7,100 | 6,500
Incentive Stock Award Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  | $ 111,800 | 246,700 | 190,100
Incentive Stock Award Plans [Member] | ASU No. 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | $ (64,700) | 4,900
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, charges at the date of modification |  |  |  |  |  |  |  |  |  |  |  | $ 58,600
Restricted Stock Units and Restricted Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total number of stock awards outstanding |  | 16,400,000 |  |  |  |  |  |  |  | 16,400,000 |  |
Unvested stock awards outstanding | 13,938,000 | 14,117,000 |  |  |  | 13,938,000 |  |  |  | 14,117,000 | 13,938,000 |
Unrecognized compensation expense related to non-vested options |  | $ 297,400 |  |  |  |  |  |  |  | $ 297,400 |  |
Weighted-average period, compensation cost expected to recognized, in years |  |  |  |  |  |  |  |  |  | 2 years 9 months 18 days |  |
Fair value of stock awards vested |  |  |  |  |  |  |  |  |  | $ 83,600 |  |
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Awards vesting period in years |  |  |  |  |  |  |  |  |  | 5 years |  |
Award performance period |  |  |  |  |  |  |  |  |  | 4 years |  |
Total number of stock awards outstanding |  | 700,000 |  |  |  |  |  |  |  | 700,000 |  |
Unvested stock awards outstanding |  | 700,000 |  |  |  |  |  |  |  | 700,000 |  |
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] | Incentive Stock Award Plans [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] | Restricted Stock Awards [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] | 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] | Incentive Stock Award Plans [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] | Restricted Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Awards vesting period in years |  |  |  |  |  |  |  |  |  | 5 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] | 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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