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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2016
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings per Share | The following table sets forth the calculation of basic and diluted earnings per share:
|  |  | Three Months Ended |  | Six Months Ended
|  |  | June 30, |  | June 30,
(in thousands, except per share data) |  |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015
Net income |  | $ | 12,685 |  | $ | 21,210 |  | $ | 23,737 |  | $ | 35,415
Denominator for basic earnings per share - |  |  |  |  |  |  |  |  |  |  |  |
| weighted-average number of common |  |  |  |  |  |  |  |  |  |  |  |
| shares outstanding during the period |  |  | 49,323 |  |  | 52,180 |  |  | 49,586 |  |  | 52,321
Incremental common shares attributable to |  |  |  |  |  |  |  |  |  |  |  |
| exercise of dilutive options |  |  | 287 |  |  | 386 |  |  | 289 |  |  | 387
Incremental common shares attributable |  |  |  |  |  |  |  |  |  |  |  |
| to outstanding restricted stock units |  |  | 57 |  |  | 105 |  |  | 167 |  |  | 176
Denominator for diluted earnings per share |  |  | 49,667 |  |  | 52,671 |  |  | 50,042 |  |  | 52,884
Basic earnings per share |  | $ | 0.26 |  | $ | 0.41 |  | $ | 0.48 |  | $ | 0.68
Diluted earnings per share |  | $ | 0.26 |  | $ | 0.40 |  | $ | 0.47 |  | $ | 0.67

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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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