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Employee Incentive, Deferred Compensation, And Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized to grant | 5,500,000 |
Stock-based compensation | $ 27,072 | $ 27,915
Contributions to the Profit Sharing Plan | 400 | 400
Incentive Stock Award Plans [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation | 23,900 | $ 31,200
Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense related to non-vested options | $ 311,100 |
Weighted-average period, compensation cost expected to recognized, in years | 3 years |
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 |
Unvested stock awards outstanding | 12,700,000 |
Performance-based Restricted Stock Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total number of stock awards outstanding | 600,000 |
Unvested stock awards outstanding | 600,000 |
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% |
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] | 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] | 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] |  |
Award restriction period for sale or disposition | 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] | 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] | 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] |  |
Award restriction period for sale or disposition | 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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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