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Net Income Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The calculation of net income per share for the three years ended December 31, 2017 is reflected in the following table (in thousands, except per share amounts):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Net income |  | $ | 290,584 |  |  | $ | 343,389 |  |  | $ | 357,796 |
Basic: |  |  |  |  |  |
Weighted average shares |  | 124,152 |  |  | 127,991 |  |  | 131,749 |
Diluted: |  |  |  |  |  |
Weighted average shares |  | 124,152 |  |  | 127,991 |  |  | 131,749 |
Dilutive effect of potential common shares |  | 740 |  |  | 775 |  |  | 1,181 |
Diluted weighted average shares |  | 124,892 |  |  | 128,766 |  |  | 132,930 |
Net income per share: |  |  |  |  |  |
Basic |  | $ | 2.34 |  |  | $ | 2.68 |  |  | $ | 2.72 |
Diluted |  | $ | 2.33 |  |  | $ | 2.67 |  |  | $ | 2.69 |
Potential common shares include the dilutive effect of stock options, unvested performance-based restricted stock, restricted stock which contains forfeitable rights to dividends, and stock units. Employee stock options will have a dilutive effect under the treasury method only when the respective period’s average market value of the Company’s common stock exceeds the exercise proceeds. Under the treasury method, exercise proceeds include the amount the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of tax benefits that would be recorded in capital surplus, if the options were exercised and the stock units and performance-based restricted stock had vested.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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