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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock Based Compensation Expense |
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﻿ |  |  |  |  |  |  |  |
﻿ | Year ended December 31,
﻿ | 2016 |  | 2015 |  | 2014
﻿Stock-based compensation expense | $ | 65,112 |  | $ | 59,465 |  | $ | 97,618
﻿Stock-based compensation expense, net of tax |  | 35,974 |  |  | 36,666 |  |  | 60,084
﻿Stock-based compensation expense recognized as capitalized development |  | 946 |  |  | 1,554 |  |  | 1,178
﻿
Summary Of Option And SOSAR Activity Under Incentive Plan | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2016 |  | 2015 |  | 2014
﻿ | 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 | 1,694 |  | $ | 490.70 |  | 2,087 |  | $ | 395.46 |  | 1,690 |  | $ | 312.44
﻿Granted | 460 |  | $ | 457.77 |  | 379 |  | $ | 659.12 |  | 764 |  | $ | 545.66
﻿Exercised | (124) |  | $ | 315.87 |  | (716) |  | $ | 297.25 |  | (315) |  | $ | 310.32
﻿Forfeited or cancelled | (113) |  | $ | 559.25 |  | (56) |  | $ | 554.73 |  | (52) |  | $ | 419.74
﻿Outstanding, end of year | 1,917 |  | $ | 490.06 |  | 1,694 |  | $ | 490.70 |  | 2,087 |  | $ | 395.46
﻿
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﻿ |  |  |  |  |  |  |  |  |
﻿ | Shares |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Years of Contractual Life |  | Aggregate Intrinsic Value
﻿Outstanding as of December 31, 2016 | 1,917 |  | $ | 490.06 |  | 4.4 |  | $ | 22,040
﻿Vested and expected to vest as of December 31, 2016 | 1,851 |  | $ | 489.18 |  | 4.3 |  | $ | 22,040
﻿Exercisable as of December 31, 2016 | 846 |  | $ | 422.32 |  | 3.3 |  | $ | 22,040
﻿
Summary Of Non-Vested Stock Award Activity Under Incentive Plan |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2016 |  | 2015 |  | 2014
﻿ | 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 | 116 |  | $ | 511.88 |  | 70 |  | $ | 525.60 |  | 71 |  | $ | 520.27
﻿Granted | 90 |  | $ | 509.05 |  | 47 |  | $ | 785.32 |  | 2 |  | $ | 495.92
﻿Vested | (7) |  | $ | 605.83 |  | (1) |  | $ | 413.07 |  | (2) |  | $ | 284.11
﻿Forfeited or cancelled | (74) |  | $ | 529.54 |  | - |  | $ | 534.55 |  | (1) |  | $ | 410.55
﻿Outstanding, end of year | 125 |  | $ | 606.24 |  | 116 |  | $ | 511.88 |  | 70 |  | $ | 525.60
﻿
Performance Shares [Member] |
Schedule Of Assumptions to Value SOSAR or Stock Awards Granted |
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﻿ |  |  |  |  |  | 2016 |  | 2015
﻿Risk-free interest rate |  |  |  |  |  |  | 0.9 | % |  |  | 1.0 | %
﻿Expected life (years) |  |  |  |  |  |  | 3.0 |  |  |  | 2.9 |
﻿Expected dividend yield |  |  |  |  |  |  | 0.0 | % |  |  | 0.0 | %
﻿Volatility |  |  |  |  |  |  | 31.4 | % |  |  | 33.7 | %
﻿
SOSARS [Member] |
Schedule Of Assumptions to Value SOSAR or Stock Awards Granted |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 2016 |  | 2015 |  | 2014
﻿Risk-free interest rate |  |  | 1.0 | % |  |  | 1.1 | % |  |  | 0.8 | %
﻿Expected life (years) |  |  | 3.5 |  |  |  | 3.4 |  |  |  | 3.4 |
﻿Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
﻿Volatility |  |  | 32.2 | % |  |  | 30.8 | % |  |  | 33.3 | %
﻿Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 117.48 |  |  | $ | 156.32 |  |  | $ | 136.18 |
﻿

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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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