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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
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 2018, 2017 and 2016 were $13.04, $16.78 and $12.43, respectively, using the following assumptions:
|  | 2018 |  | 2017 |  | 2016
Expected term (in years) |  | 6.34 |  |  | 6.00 |  |  | 6.00 |
Expected volatility |  | 25.27 | % |  | 22.58 | % |  | 25.44 | %
Expected dividend yield |  | 1.35 | % |  | 0.82 | % |  | 1.10 | %
Risk-free interest rate |  | 2.75 | % |  | 2.29 | % |  | 2.18 | %
Stock-based Compensation Expense | The Company recognized stock-based compensation expense in its Consolidated Financial Statements in 2018, 2017 and 2016 as follows:
|  | 2018 |  | 2017 |  | 2016
Stock-based compensation expense |  | $ | 23,805 |  |  | $ | 36,366 |  |  | $ | 16,017 |
Less: Deferred tax benefit |  | (5,078 | ) |  | (7,891 | ) |  | (5,612 | )
Stock-based compensation expense, net of tax |  | $ | 18,727 |  |  | $ | 28,475 |  |  | $ | 10,405 |
Stock Option Plans | This table presents certain information relating to the Company’s stock option plans for 2018, 2017 and 2016:
|  | Number of Shares |  | Weighted Avg. Price
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 |
Granted |  | 2,468,000 |  |  | 49.94 |
Exercised |  | (3,232,000 | ) |  | 25.93 |
Expired or canceled |  | (135,000 | ) |  | 49.58 |
Balance as of December 31, 2018 |  | 15,813,000 |  |  | $ | 41.84 |
Exercisable as of December 31, 2018 |  | 9,359,000 |  |  | $ | 32.89 |
Available for future grant as of December 31, 2018 |  | 21,775,000 |  |  |
Stock Options Outstanding And Exercisable | This table summarizes information relating to all options outstanding and exercisable at December 31, 2018:
|  |  | Options Outstanding at December 31, 2018 |  | Options Exercisable at December 31, 2018
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 |  | - | 21.05 | 1,996,000 |  |  | $ | 16.63 |  |  | 2.09 |  | 1,996,000 |  |  | $ | 16.63 |  |  | 2.09
22.45 |  | - | 23.86 | 2,379,000 |  |  | 23.13 |  |  | 3.04 |  | 2,379,000 |  |  | 23.13 |  |  | 3.04
27.03 |  | - | 40.64 | 3,332,000 |  |  | 37.10 |  |  | 5.54 |  | 2,390,000 |  |  | 35.70 |  |  | 5.36
45.99 |  | - | 53.16 | 4,268,000 |  |  | 49.01 |  |  | 9.06 |  | 908,000 |  |  | 49.61 |  |  | 8.00
53.34 |  | - | 71.12 | 3,838,000 |  |  | 62.69 |  |  | 8.19 |  | 1,686,000 |  |  | 53.36 |  |  | 7.02
|  |  | 15,813,000 |  |  |  |  |  |  | 9,359,000 |  |  |  |  |
Common Stock Buyback | The following table provides the total number of shares repurchased and the related total costs in 2018, 2017 and 2016:
Year |  | Total Number of Shares Repurchased |  | Total Cost
2018 |  | 6,744,000 |  |  | $ | 404,759 |
2017 |  | 4,403,000 |  |  | 248,114 |
2016 |  | 6,600,000 |  |  | 294,374 |

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