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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Assumptions Used In The Weighted Average Fair Value Of The Stock Options Granted | The weighted average fair value of the Company’s stock options granted during 2017, 2016 and 2015 were $16.78, $12.43 and $12.16, respectively, using the following assumptions:
|  | 2017 |  | 2016 |  | 2015
Expected term (in years) |  | 6.00 |  |  | 6.00 |  |  | 5.58 |
Expected volatility |  | 22.58 | % |  | 25.44 | % |  | 23.86 | %
Expected dividend yield |  | 0.82 | % |  | 1.10 | % |  | 1.00 | %
Risk-free interest rate |  | 2.29 | % |  | 2.18 | % |  | 1.90 | %
Stock-based Compensation Expense | The Company recognized stock-based compensation expense in its Consolidated Financial Statements in 2017, 2016 and 2015 as follows:
|  | 2017 |  | 2016 |  | 2015
Stock-based compensation expense |  | $ | 36,366 |  |  | $ | 16,017 |  |  | $ | 17,312 |
Less: Deferred tax benefit |  | (7,891 | ) |  | (5,612 | ) |  | (6,107 | )
Stock-based compensation expense, net of tax |  | $ | 28,475 |  |  | $ | 10,405 |  |  | $ | 11,205 |
Stock Option Plans | This table presents certain information relating to the Company’s stock option plans for 2017, 2016 and 2015:
|  | Number of Shares |  | Weighted Avg. Price
Balance as of December 31, 2014 |  | 20,461,000 |  |  | $ | 25.26 |
Granted |  | 2,005,000 |  |  | 53.34 |
Exercised |  | (2,927,000 | ) |  | 21.44 |
Expired or canceled |  | (302,000 | ) |  | 28.97 |
Balance as of December 31, 2015 |  | 19,237,000 |  |  | $ | 28.71 |
Granted |  | 2,310,000 |  |  | 49.57 |
Exercised |  | (1,809,000 | ) |  | 24.82 |
Expired or canceled |  | (1,669,000 | ) |  | 30.86 |
Balance as of December 31, 2016 |  | 18,069,000 |  |  | $ | 31.57 |
Granted |  | 2,057,000 |  |  | 69.87 |
Exercised |  | (2,370,000 | ) |  | 21.22 |
Expired or canceled |  | (1,044,000 | ) |  | 33.42 |
Balance as of December 31, 2017 |  | 16,712,000 |  |  | $ | 37.63 |
Exercisable as of December 31, 2017 |  | 10,624,000 |  |  | $ | 28.99 |
Available for future grant as of December 31, 2017 |  | 24,108,000 |  |  |
Stock Options Outstanding And Exercisable | This table summarizes information relating to all options outstanding and exercisable at December 31, 2017:
|  |  | Options Outstanding at December 31, 2017 |  | Options Exercisable at December 31, 2017
Range of Exercise Prices (Per Share) | Number of Shares |  | Weighted Average Exercise Price (Per Share) |  | Weighted Average Remaining Contractual Life (Years) |  | Number of Shares |  | Weighted Average Exercise Price (Per Share) |  | Weighted Average Remaining Contractual Life (Years)
$ | 14.62 |  | - | 15.77 | 2,178,000 |  |  | $ | 15.45 |  |  | 3.16 |  | 2,178,000 |  |  | $ | 15.45 |  |  | 3.16
17.65 |  | - | 21.05 | 1,174,000 |  |  | 17.67 |  |  | 2.01 |  | 1,174,000 |  |  | 17.67 |  |  | 2.01
22.45 |  | - | 23.86 | 3,432,000 |  |  | 23.19 |  |  | 3.95 |  | 3,422,000 |  |  | 23.19 |  |  | 3.96
27.03 |  | - | 39.15 | 1,815,000 |  |  | 33.65 |  |  | 6.09 |  | 747,000 |  |  | 33.58 |  |  | 6.09
40.64 |  | - | 53.16 | 4,190,000 |  |  | 45.49 |  |  | 8.54 |  | 2,095,000 |  |  | 45.49 |  |  | 8.08
53.34 |  | - | 71.12 | 3,923,000 |  |  | 62.01 |  |  | 9.05 |  | 1,008,000 |  |  | 53.39 |  |  | 8.14
|  |  | 16,712,000 |  |  |  |  |  |  | 10,624,000 |  |  |  |  |
Common Stock Buyback | The following table provides the total number of shares repurchased and the related total costs in 2017, 2016 and 2015:
Year |  | Total Number of Shares Repurchased |  | Total Cost
2017 |  | 4,403,000 |  |  | $ | 248,114 |
2016 |  | 6,600,000 |  |  | 294,374 |
2015 |  | 5,951,000 |  |  | 289,587 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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