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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic Earnings and Diluted Earnings Per Share Data | Basic earnings and diluted earnings per share data were computed as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Numerator for basic and diluted earnings per share: |  |  |  |  |
Net income | $ | 163,945 |  |  | $ | 109,857 |  |  | $ | 64,869 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average basic common shares outstanding | 37,273 |  |  | 36,448 |  |  | 34,137 |
Assumed conversion of dilutive securities: |  |  |  |  |
Stock options | 1,973 |  |  | 2,513 |  |  | 2,415 |
Denominator for diluted earnings per share - Adjusted weighted-average shares | 39,246 |  |  | 38,961 |  |  | 36,552 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic | $ | 4.40 |  |  | $ | 3.01 |  |  | $ | 1.90 |
Diluted | $ | 4.18 |  |  | $ | 2.82 |  |  | $ | 1.77 |

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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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