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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share | The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 30,171 |  |  | $ | 15,239 |  |  | $ | 71,806 |  |  | $ | 47,884 |
Denominator (in thousands): |  |  |  |  |  |  |  |
Weighted-average common shares for calculating basic earnings per share |  | 44,942 |  |  | 48,261 |  |  | 45,680 |  |  | 48,324 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options and nonvested common stock awards |  | 101 |  |  | 28 |  |  | 77 |  |  | 21 |
Weighted-average common shares for calculating diluted earnings per share |  | 45,043 |  |  | 48,289 |  |  | 45,757 |  |  | 48,345 |
Net income per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.67 |  |  | $ | 0.32 |  |  | $ | 1.57 |  |  | $ | 0.99 |
Diluted |  | $ | 0.67 |  |  | $ | 0.32 |  |  | $ | 1.57 |  |  | $ | 0.99 |

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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/2003/role/presentationRef -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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