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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings per Share |
|  |  | Three Months Ended
|  |  | March 31,
(in thousands, except per share data) |  |  | 2015 |  |  | 2014
Net income |  | $ | 14,205 |  | $ | 19,125
Denominator for basic earnings per share - |  |  |  |  |  |
| weighted-average number of common |  |  |  |  |  |
| shares outstanding during the period |  |  | 52,463 |  |  | 53,650
Incremental common shares attributable to |  |  |  |  |  |
| exercise of dilutive options |  |  | 391 |  |  | 436
Incremental common shares attributable |  |  |  |  |  |
| to outstanding restricted shares and |  |  |  |  |  |
| restricted stock units |  |  | 191 |  |  | 191
Denominator for diluted earnings per share |  |  | 53,045 |  |  | 54,277
Basic earnings per share |  | $ | 0.27 |  | $ | 0.36
Diluted earnings per share |  | $ | 0.27 |  | $ | 0.35

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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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