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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Details of basic and diluted earnings per share (EPS) |
|  | Three months ended March 31 |
In thousands, except per share |  | 2013 |  |  | 2012 |
Net income |  | $ | 15,629 |  |  | $ | 18,878 |
Weighted average common shares outstanding used in basic EPS |  |  | 42,966 |  |  |  | 42,751 |
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs |  |  | 955 |  |  |  | 716 |
Weighted average common shares outstanding and common share equivalents used in diluted EPS |  |  | 43,921 |  |  |  | 43,467 |
Earnings per share |  |  |  |  |  |  |  |
Basic |  | $ | 0.36 |  |  | $ | 0.44 |
Diluted |  |  | 0.36 |  |  |  | 0.43 |
Number of potential common shares that have been excluded from the computation of diluted earnings per share for the indicated period due to their anti-dilutive nature |
|  | March 31 |
In thousands |  | 2013 |  |  | 2012 |
Potential common shares |  |  | — |  |  |  | 589 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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