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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 64,869 |  |  | $ | 58,940 |  |  | $ | 39,101 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average basic common shares outstanding |  |  | 34,137 |  |  |  | 33,011 |  |  |  | 31,891 |
Assumed conversion of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 2,415 |  |  |  | 2,390 |  |  |  | 2,699 |
Denominator for diluted earnings per share - Adjusted weighted-average shares |  |  | 36,552 |  |  |  | 35,401 |  |  |  | 34,590 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.90 |  |  | $ | 1.79 |  |  | $ | 1.23 |
Diluted |  | $ | 1.77 |  |  | $ | 1.66 |  |  | $ | 1.13 |

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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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