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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock-Based Compensation Expense |
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﻿ |  |  |  |  |  |  |  |
﻿ | Year ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Stock-based compensation expense | $ | 66,396 |  | $ | 65,112 |  | $ | 59,465
﻿Stock-based compensation expense, net of tax | $ | 40,370 |  | $ | 35,974 |  | $ | 36,666
﻿Stock-based compensation expense recognized as capitalized development | $ | 1,141 |  | $ | 946 |  | $ | 1,554
﻿Excess tax benefit on stock-based compensation recognized in provision for income taxes | $ | 448 |  | $ | - |  | $ | -
﻿
Summary Of Option And SOSAR Activity Under Incentive Plan | ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2017 |  | 2016 |  | 2015
﻿ | 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 | 1,917 |  | $ | 490.06 |  | 1,694 |  | $ | 490.70 |  | 2,087 |  | $ | 395.46
﻿Granted | 304 |  | $ | 426.70 |  | 460 |  | $ | 457.77 |  | 379 |  | $ | 659.12
﻿Exercised | (35) |  | $ | 307.83 |  | (124) |  | $ | 315.87 |  | (716) |  | $ | 297.25
﻿Forfeited or cancelled | (187) |  | $ | 527.53 |  | (113) |  | $ | 559.25 |  | (56) |  | $ | 554.73
﻿Outstanding, end of year | 1,999 |  | $ | 480.09 |  | 1,917 |  | $ | 490.06 |  | 1,694 |  | $ | 490.70
﻿ ﻿
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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, 2017 | 1,999 |  | $ | 480.09 |  | 3.7 |  | $ | 209
﻿Vested and expected to vest as of December 31, 2017 | 1,957 |  | $ | 480.77 |  | 3.7 |  | $ | 209
﻿Exercisable as of December 31, 2017 | 1,130 |  | $ | 474.20 |  | 2.7 |  | $ | 209
﻿
Summary Of Non-Vested Stock Award Activity Under Incentive Plan |
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﻿ | 2017 |  | 2016 |  | 2015
﻿ | Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Shares |  | Weighted Average Grant Date Fair Value Per Share
﻿Outstanding, beginning of year | 125 |  | $ | 606.24 |  | 116 |  | $ | 511.88 |  | 70 |  | $ | 525.60
﻿Granted | 127 |  | $ | 436.36 |  | 90 |  | $ | 509.05 |  | 47 |  | $ | 785.32
﻿Vested | (8) |  | $ | 454.84 |  | (7) |  | $ | 605.83 |  | (1) |  | $ | 413.07
﻿Forfeited or cancelled | (31) |  | $ | 502.46 |  | (74) |  | $ | 529.54 |  | - |  | $ | 534.55
﻿Outstanding, end of year | 213 |  | $ | 519.62 |  | 125 |  | $ | 606.24 |  | 116 |  | $ | 511.88
﻿
Change In Awards Expected To Vest |
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﻿ |  |  |  |  |
﻿ | Year ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Cumulative change in expense | $ | (1,410) |  | $ | (6,031) |  | $ | (12,195)
﻿Net of tax impact from cumulative change in expense | $ | (857) |  | $ | (3,332) |  | $ | (7,520)
﻿Impact on basic earnings per share | $ | 0.03 |  | $ | 0.11 |  | $ | 0.25
﻿Impact on diluted earnings per share | $ | 0.03 |  | $ | 0.11 |  | $ | 0.24
﻿
SOSARS [Member] |
Schedule Of Assumptions to Value SOSAR or Stock Awards Granted |
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﻿ |  | 2017 |  | 2016 |  | 2015
﻿Risk-free interest rate |  |  | 1.6 | % |  |  | 1.0 | % |  |  | 1.1 | %
﻿Expected life (years) |  |  | 3.7 |  |  |  | 3.5 |  |  |  | 3.4 |
﻿Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
﻿Volatility |  |  | 29.9 | % |  |  | 32.2 | % |  |  | 30.8 | %
﻿Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 105.97 |  |  | $ | 117.48 |  |  | $ | 156.32 |
﻿
Performance Shares [Member] |
Schedule Of Assumptions to Value SOSAR or Stock Awards Granted |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Risk-free interest rate |  |  | 1.5 | % |  |  | 0.9 | % |  |  | 1.0 | %
﻿Expected life (years) |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 2.9 |
﻿Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
﻿Volatility |  |  | 29.9 | % |  |  | 31.4 | % |  |  | 33.7 | %
﻿

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