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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Basic and Diluted Earnings Per Share |
| Three months ended |  | Nine months ended
| September 30, |  | September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income | $ | 80,244 |  | $ | 98,582 |  | $ | 164,807 |  | $ | 277,742
Shares: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares outstanding (for basic calculation) |  | 27,973 |  |  | 27,775 |  |  | 27,892 |  |  | 27,730
Dilutive stock awards |  | 481 |  |  | 613 |  |  | 478 |  |  | 538
Weighted-average number of common shares outstanding (for diluted calculation) |  | 28,454 |  |  | 28,388 |  |  | 28,370 |  |  | 28,268
Basic earnings per share | $ | 2.87 |  | $ | 3.55 |  | $ | 5.91 |  | $ | 10.02
Diluted earnings per share | $ | 2.82 |  | $ | 3.47 |  | $ | 5.81 |  | $ | 9.83
Stock Awards Excluded from the Calculation of Diluted EPS |
| Three months ended |  | Nine months ended
| September 30, |  | September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Stock awards subject to performance conditions |  | 100 |  |  | 84 |  |  | 97 |  |  | 83
Stock awards that were antidilutive |  | 2 |  |  | 17 |  |  | 74 |  |  | 178
Total stock awards excluded from diluted earnings per share |  | 102 |  |  | 101 |  |  | 171 |  |  | 261

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- Definition Stock awards excluded from the calculation of diluted EPS - consisting of awards subject to performance conditions and awards that were antidilutive. + References No definition available. + Details
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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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