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Earnings Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | 14 Earnings Per Share Basic and diluted EPS calculations are detailed as follows (in thousands, except per share data):
|  | Year Ended December 31, 2018 |
|  | Net Income |  |  | Weighted-Average Shares |  |  | Per Share |
|  | (Numerator) |  |  | (Denominator) |  |  | Amount |
Net income per basic common share |  | $ | 593,794 |  |  |  | 76,992 |  |  | $ | 7.71 |
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities |  |  | — |  |  |  | 626 |  |  |  | (0.06 | )
Net income per diluted common share |  | $ | 593,794 |  |  |  | 77,618 |  |  | $ | 7.65 |
|  | Year Ended December 31, 2017 |
|  | Net Income |  |  | Weighted-Average Shares |  |  | Per Share |
|  | (Numerator) |  |  | (Denominator) |  |  | Amount |
Net income per basic common share |  | $ | 20,311 |  |  |  | 79,793 |  |  | $ | 0.25 |
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities |  |  | — |  |  |  | 811 |  |  |  | — |
Net income per diluted common share |  | $ | 20,311 |  |  |  | 80,604 |  |  | $ | 0.25 |
|  | Year Ended December 31, 2016 |
|  | Net Income |  |  | Weighted-Average Shares |  |  | Per Share |
|  | (Numerator) |  |  | (Denominator) |  |  | Amount |
Net income per basic common share |  | $ | 521,503 |  |  |  | 80,786 |  |  | $ | 6.46 |
Effect of dilutive stock option, restricted stock, performance stock unit and restricted stock unit securities |  |  | — |  |  |  | 631 |  |  |  | (0.05 | )
Net income per diluted common share |  | $ | 521,503 |  |  |  | 81,417 |  |  | $ | 6.41 |
For the years ended December 31, 2018, 2017 and 2016, the Company had 0.1 million, 0.4 million and 0.9 million stock options that were antidilutive, respectively, due to having higher exercise prices than the Company’s average stock price during the period. These securities were not included in the computation of diluted EPS. The effect of dilutive securities was calculated using the treasury stock method.

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