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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings per Share | The following table sets forth the calculation of basic and diluted earn ings per share:
|  |  | Three Months Ended |  | Nine Months Ended
|  |  | September 30, |  | September 30,
(in thousands, except per share data) |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016
Net income |  | $ | 17,512 |  | $ | 21,742 |  | $ | 44,375 |  | $ | 45,479
Denominator for basic earnings per share - |  |  |  |  |  |  |  |  |  |  |  |
| weighted-average number of common |  |  |  |  |  |  |  |  |  |  |  |
| shares outstanding during the period |  |  | 49,865 |  |  | 48,965 |  |  | 49,716 |  |  | 49,377
Incremental common shares attributable to |  |  |  |  |  |  |  |  |  |  |  |
| exercise of dilutive options |  |  | 268 |  |  | 323 |  |  | 319 |  |  | 304
Incremental common shares attributable |  |  |  |  |  |  |  |  |  |  |  |
| to outstanding restricted stock units |  |  | 197 |  |  | 126 |  |  | 257 |  |  | 197
Denominator for diluted earnings per share |  |  | 50,330 |  |  | 49,414 |  |  | 50,292 |  |  | 49,878
Basic earnings per share |  | $ | 0.35 |  | $ | 0.44 |  | $ | 0.89 |  | $ | 0.92
Diluted earnings per share |  | $ | 0.35 |  | $ | 0.44 |  | $ | 0.88 |  | $ | 0.91

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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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