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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Share-Based Compensation [Abstract] |
Schedule Of Selected Financial Impact Of Share-Based Compensation |
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﻿ |  | For the Years Ended December 31, |
﻿ |  | 2016 |  |  | 2015 |  |  | 2014 |
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﻿Share-based compensation expense included in cost of revenue | $ | 2,305 |  | $ | 2,138 |  | $ | 1,937 |
﻿Share-based compensation expense included in operating expenses |  | 17,586 |  |  | 17,746 |  |  | 16,162 |
﻿Total share-based compensation expense included in consolidated statements of income |  | 19,891 |  |  | 19,884 |  |  | 18,099 |
﻿Income tax benefit resulting from share-based compensation arrangements |  | (6,143 | ) |  | (6,229 | ) |  | (6,107 | )
﻿Net impact of share-based compensation on net income | $ | 13,748 |  | $ | 13,655 |  | $ | 11,992 |
﻿
Schedule Of Weighted Averages Of The Assumptions Used In Estimating The Fair Value Of Stock Option Awards |
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﻿ |  | For the Years Ended December 31, |
﻿ |  |  | 2016 |  |  |  | 2015 |  |  |  | 2014 |
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﻿Expected stock price volatility |  |  | 25 | % |  |  | 23 | % |  |  | 28 | %
﻿Expected term, in years |  |  | 5.7 |  |  |  | 5.6 |  |  |  | 5.7 |
﻿Risk-free interest rate |  |  | 1.2 | % |  |  | 1.5 | % |  |  | 1.5 | %
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﻿Weighted average fair value of options granted |  | $ | 17.87 |  |  | $ | 19.72 |  |  | $ | 18.07 |
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Schedule Of Stock Option Activity |
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﻿ | Number of Options (000) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000)
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﻿Outstanding as of December 31, 2015 | 3,384 |  | $ | 49.76 |  |  |  |  |
﻿Granted | 745 |  |  | 69.07 |  |  |  |  |
﻿Exercised | (838) |  |  | 37.04 |  |  |  |  |
﻿Forfeited | (115) |  |  | 59.34 |  |  |  |  |
﻿Expired | - |  |  | - |  |  |  |  |
﻿Outstanding as of December 31, 2016 | 3,176 |  | $ | 57.31 |  | 5.3 |  | $ | 190,424
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﻿Fully vested as of December 31, 2016 | 1,510 |  | $ | 46.92 |  | 3.2 |  | $ | 106,255
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﻿Fully vested and expected to vest as of December 31, 2016 | 3,034 |  | $ | 56.78 |  | 5.2 |  | $ | 183,550
﻿
Schedule Of Restricted Stock Unit Activity |
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﻿ |  |  |  |  | Number of Units (000) |  | Weighted Average Grant-Date Fair Value
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﻿Nonvested as of December 31, 2015 |  |  |  |  |  | 498 |  | $ | 58.94
﻿Granted |  |  |  |  |  | 173 |  |  | 69.14
﻿Vested |  |  |  |  |  | (170) |  |  | 52.60
﻿Forfeited |  |  |  |  |  | (33) |  |  | 60.46
﻿Nonvested as of December 31, 2016 |  |  |  |  |  | 468 |  | $ | 64.88
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﻿Expected to vest as of December 31, 2016 |  |  |  |  |  | 418 |  | $ | 64.44
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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 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units 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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