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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock Based Compensation Expense |
| Year ended December 31,
| 2015 |  | 2014 |  | 2013
Stock-based compensation expense | $ | 59,465 |  | $ | 97,618 |  | $ | 64,781
Stock-based compensation expense, net of tax |  | 36,666 |  |  | 60,084 |  |  | 39,465
Stock-based compensation expense recognized as capitalized development |  | 1,554 |  |  | 1,178 |  |  | 1,124
Summary Of Option And SOSAR Activity Under Incentive Plan |
| 2015 |  | 2014 |  | 2013
| 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 | 2,087 |  | $ | 395.46 |  | 1,690 |  | $ | 312.44 |  | 1,449 |  | $ | 274.92
Granted | 379 |  | $ | 659.12 |  | 764 |  | $ | 545.66 |  | 672 |  | $ | 320.21
Exercised | (716) |  | $ | 297.25 |  | (315) |  | $ | 310.32 |  | (369) |  | $ | 176.23
Forfeited | (56) |  | $ | 554.73 |  | (52) |  | $ | 419.74 |  | (62) |  | $ | 329.76
Outstanding, end of year | 1,694 |  | $ | 490.70 |  | 2,087 |  | $ | 395.46 |  | 1,690 |  | $ | 312.44
| Shares |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Years of Contractual Life |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2015 | 1,694 |  | $ | 490.70 |  | 4.9 |  | $ | 92,773
Vested and expected to vest as of December 31, 2015 | 1,640 |  | $ | 486.10 |  | 4.8 |  | $ | 92,622
Exercisable as of December 31, 2015 | 321 |  | $ | 339.72 |  | 3.5 |  | $ | 45,112
Summary Of Non-Vested Stock Award Activity Under Incentive Plan |
| 2015 |  | 2014 |  | 2013
| 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 | 70 |  | $ | 525.60 |  | 71 |  | $ | 520.27 |  | 120 |  | $ | 218.34
Granted | 47 |  | $ | 785.32 |  | 2 |  | $ | 495.92 |  | 68 |  | $ | 527.45
Vested | (1) |  | $ | 413.07 |  | (2) |  | $ | 284.11 |  | (117) |  | $ | 215.76
Forfeited | - |  | $ | 534.55 |  | (1) |  | $ | 410.55 |  | — |  | $ | —
Outstanding, end of year | 116 |  | $ | 511.88 |  | 70 |  | $ | 525.60 |  | 71 |  | $ | 520.27
Performance Shares [Member] |
Schedule Of Assumptions to Value SOSAR or Stock Awards Granted |
|  |  |  |  |  |  |  |  |  | 2015
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  | 1.0 | %
Expected life (years) |  |  |  |  |  |  |  |  |  |  | 2.9 |
Expected dividend yield |  |  |  |  |  |  |  |  |  |  | 0.0 | %
Volatility |  |  |  |  |  |  |  |  |  |  | 33.7 | %
SOSARS [Member] |
Schedule Of Assumptions to Value SOSAR or Stock Awards Granted |
|  | 2015 |  | 2014 |  | 2013
Risk-free interest rate |  |  | 1.1 | % |  |  | 0.8 | % |  |  | 0.5 | %
Expected life (years) |  |  | 3.4 |  |  |  | 3.4 |  |  |  | 3.4 |
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 30.8 | % |  |  | 33.3 | % |  |  | 35.4 | %
Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 156.32 |  |  | $ | 136.18 |  |  | $ | 82.51 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 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=6415400&loc=d3e5047-113901 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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