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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share Reconciliation | 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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