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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding | The following is a reconciliation between basic and diluted weighted average shares outstanding:
|  | For the three months ended June 30, |  |  | For the six months ended June 30, |
(in thousands, except per share data) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income |  | $ | 52,007 |  |  | $ | 42,471 |  |  | $ | 112,138 |  |  | $ | 91,904 |
Net income attributable to unvested awarded performance stock |  |  | (1,157 | ) |  |  | (1,248 | ) |  |  | (2,467 | ) |  |  | (2,744 | )
Net income attributable to common shares |  | $ | 50,850 |  |  | $ | 41,223 |  |  | $ | 109,671 |  |  | $ | 89,160 |
Weighted average number of common shares outstanding – basic |  |  | 144,041 |  |  |  | 143,298 |  |  |  | 143,984 |  |  |  | 143,323 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic |  |  | (3,205 | ) |  |  | (4,212 | ) |  |  | (3,168 | ) |  |  | (4,279 | )
Weighted average number of common shares outstanding for basic earnings per common share |  |  | 140,836 |  |  |  | 139,086 |  |  |  | 140,816 |  |  |  | 139,044 |
Dilutive effect of stock options |  |  | 2,185 |  |  |  | 2,742 |  |  |  | 2,122 |  |  |  | 2,620 |
Weighted average number of shares outstanding – diluted |  |  | 143,021 |  |  |  | 141,828 |  |  |  | 142,938 |  |  |  | 141,664 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.36 |  |  | $ | 0.30 |  |  | $ | 0.78 |  |  | $ | 0.64 |
Diluted |  | $ | 0.36 |  |  | $ | 0.29 |  |  | $ | 0.77 |  |  | $ | 0.63 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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