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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to grant |  |  |  |  |  |  |  |  |  | 6,700,000 |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  | $ 140,461 | $ 186,303 | $ 165,641
Provision for income tax expense (benefit) |  | $ 1,168 | $ 41,603 | $ 30,387 | $ 13,507 | $ 28,014 | $ 10,168 | $ 6,022 | $ 16,858 | 86,665 | 61,062 | 49,231
Restricted stock units, charges at the date of modification |  |  |  |  |  |  |  |  |  | $ 55,900 |  |
Vesting of outstanding debenture awards | $ 51,400 |  |  |  |  |  |  |  |  |  |  |
Options granted during the period |  |  |  |  |  |  |  |  |  | 0 |  |
Options outstanding during the period | 11,934 | 11,934 |  |  |  |  |  |  |  | 11,934 |  |
Weighted average exercise price | $ 29.33 | $ 29.33 |  |  |  |  |  |  |  | $ 29.33 |  |
Contributions to the Profit Sharing Plan |  |  |  |  |  |  |  |  |  | $ 7,100 | 6,500 | 7,700
Incentive Stock Award Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  | 246,700 | 190,100 | 142,100
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 | $ (14,700)
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 |
Common stock issued for acquisitions |  |  |  |  |  |  |  |  |  |  | $ 23,800 |
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 | 16,500,000 | 16,500,000 |  |  |  |  |  |  |  | 16,500,000 |  |
Unvested stock awards outstanding | 12,279,000 | 12,279,000 |  |  |  | 16,276,000 |  |  |  | 12,279,000 | 16,276,000 |
Unrecognized compensation expense related to non-vested options | $ 251,300 | $ 251,300 |  |  |  |  |  |  |  | $ 251,300 |  |
Weighted-average period, compensation cost expected to recognized, in years |  |  |  |  |  |  |  |  |  | 3 years 1 month 6 days |  |
Fair value of stock awards vested |  |  |  |  |  |  |  |  |  | $ 185,800 |  |
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 | 600,000 | 600,000 |  |  |  |  |  |  |  | 600,000 |  |
Unvested stock awards outstanding | 600,000 | 600,000 |  |  |  |  |  |  |  | 600,000 |  |
SWAP Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Elective deferrals vested percentage | 100.00% | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Percentage of earnings deferred into company stock units | 5.00% | 5.00% |  |  |  |  |  |  |  | 5.00% |  |
Percentage of earnings deferred into company stock units, Company match | 25.00% | 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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