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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Stock-Based Compensation [Abstract] |
Summary Of Option And SOSAR Activity Under Incentive Plan |
| 2014 |  | 2013 |  |  | 2012
| Shares |  | Weighted-Average Exercise Price Per Share |  | Shares |  | Weighted-Average Exercise Price Per Share |  |  | Shares |  | Weighted-Average Exercise Price Per Share
Outstanding, beginning of year | 1,690 |  | $ | 312.44 |  | 1,449 |  | $ | 274.92 |  |  | 1,486 |  | $ | 157.07
Granted | 764 |  | $ | 545.66 |  | 672 |  | $ | 320.21 |  |  | 617 |  | $ | 371.70
Exercised | (315) |  | $ | 310.32 |  | (369) |  | $ | 176.23 |  |  | (592) |  | $ | 80.31
Forfeited | (52) |  | $ | 419.74 |  | (62) |  | $ | 329.76 |  |  | (62) |  | $ | 274.25
Outstanding, end of year | 2,087 |  | $ | 395.46 |  | 1,690 |  | $ | 312.44 |  |  | 1,449 |  | $ | 274.92
| Shares |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Years of Contractual Life |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2014 | 2,087 |  | $ | 395.46 |  | 4.9 |  | $ | 603,356
Vested and expected to vest as of December 31, 2014 | 2,039 |  | $ | 393.06 |  | 4.9 |  | $ | 594,198
Exercisable as of December 31, 2014 | 482 |  | $ | 271.38 |  | 3.2 |  | $ | 199,045
Summary Of Non-Vested Stock Award Activity Under Incentive Plan |
| 2014 |  | 2013 |  |  | 2012
| Shares |  | Grant Date Fair Value Per Share |  | Shares |  | Grant Date Fair Value Per Share |  |  | Shares |  | Grant Date Fair Value Per Share
Outstanding, beginning of year | 71 |  | $ | 520.27 |  | 120 |  | $ | 218.34 |  |  | 207 |  | $ | 153.40
Granted | 2 |  | $ | 495.92 |  | 68 |  | $ | 527.45 |  |  | 1 |  | $ | 401.56
Vested | (2) |  | $ | 284.11 |  | (117) |  | $ | 215.76 |  |  | (83) |  | $ | 55.92
Forfeited | (1) |  | $ | 410.55 |  | — |  | $ | — |  |  | (5) |  | $ | 267.23
Outstanding, end of year | 70 |  | $ | 525.60 |  | 71 |  | $ | 520.27 |  |  | 120 |  | $ | 218.34
Schedule Of Assumptions to Value SOSAR Awards Granted |
|  | 2014 |  | 2013 |  | 2012
Risk-free interest rate |  |  | 0.8 | % |  |  | 0.5 | % |  |  | 0.4 | %
Expected life (years) |  |  | 3.4 |  |  |  | 3.4 |  |  |  | 3.4 |
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 33.3 | % |  |  | 35.4 | % |  |  | 39.1 | %
Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 136.18 |  |  | $ | 82.51 |  |  | $ | 104.97 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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