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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary Of Stock-Based Compensation Expense |
| Year ended December 31,
| 2020 |  | 2019 |  | 2018
Stock-based compensation | $ | 84,463 |  | $ | 92,062 |  | $ | 69,947
Stock-based compensation, net of income taxes | $ | 69,904 |  | $ | 73,866 |  | $ | 51,544
Total capitalized stock-based compensation included in net leasehold improvements, property and equipment on the consolidated balance sheets | $ | 1,837 |  | $ | 666 |  | $ | 783
Excess tax benefit (deficit) on stock-based compensation recognized in provision for income taxes | $ | 49,690 |  | $ | 16,203 |  | $ | (6,162)
SOSARS [Member] |
Summary Of Option And SOSAR Activity Under Incentive Plan |
| Shares |  | Weighted-Average Exercise Price per Share |  | Weighted-Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, January 1, 2020 |  | 1,132 |  | $ | 457.14 |  |  |  |  | $ | 430,595
Granted |  | 116 |  |  | 874.14 |  |  |  |  |  |
Exercised |  | (470) |  |  | 433.10 |  |  |  |  |  |
Forfeited or cancelled |  | (30) |  |  | 513.19 |  |  |  |  |  |
Outstanding, December 31, 2020 |  | 748 |  |  | 533.71 |  |  | 3.9 |  |  | 637,905
Exercisable, December 31, 2020 |  | 235 |  |  | 476.68 |  |  | 1.6 |  |  | 213,697
Vested and expected to vest, December 31, 2020 |  | 728 |  |  | 528.03 |  |  | 3.9 |  |  | 625,050
Schedule Of Assumptions For SOSAR And PSUs |
|  | 2020 |  | 2019 |  | 2018
Risk-free interest rate |  |  | 1.3 | % |  |  | 2.4 | % |  |  | 2.4 | %
Expected life (years) |  |  | 3.8 |  |  |  | 3.9 |  |  |  | 3.9 |
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 32.4 | % |  |  | 34.7 | % |  |  | 32.2 | %
Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 231.52 |  |  | $ | 176.79 |  |  | $ | 77.61 |
Restricted Stock Units (RSUs) [Member] |
Summary Of Stock Award Activity Under Incentive Plan |
|  |  |  |  |  | Shares |  | Weighted-Average Grant Date Fair Value per Share
Outstanding, January 1, 2020 |  |  |  |  |  |  |  | 121 |  | $ | 408.56
Granted |  |  |  |  |  |  |  | 42 |  |  | 905.96
Vested |  |  |  |  |  |  |  | (60) |  |  | 381.71
Forfeited or cancelled |  |  |  |  |  |  |  | (11) |  |  | 619.11
Outstanding, December 31, 2020 |  |  |  |  |  |  |  | 92 |  |  | 631.66
Vested and expected to vest, December 31, 2020 |  |  |  |  |  |  |  | 84 |  |  | 618.08
Performance Stock Awards (PSUs) [Member] |
Summary Of Stock Award Activity Under Incentive Plan |
|  |  |  |  |  | Shares |  | Weighted-Average Grant Date Fair Value per Share
Outstanding, January 1, 2020 |  |  |  |  |  |  |  | 103 |  | $ | 479.83
Granted |  |  |  |  |  |  |  | 27 |  |  | 853.03
Vested |  |  |  |  |  |  |  | (29) |  |  | 466.22
Expired |  |  |  |  |  |  |  | (1) |  |  | 605.39
Outstanding, December 31, 2020 |  |  |  |  |  |  |  | 100 |  |  | 583.46
Vested and expected to vest, December 31, 2020 |  |  |  |  |  |  |  | 229 |  |  | 765.23

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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