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Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
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 March 31,
(in thousands, except per share data) | 2015 |  | 2014
Net income | $ | 56,951 |  |  | $ | 52,415 |
Net income attributable to unvested awarded performance stock | (1,363 | ) |  | (1,376 | )
Net income attributable to common shares | $ | 55,588 |  |  | $ | 51,039 |
Weighted average number of common shares outstanding – basic | 142,777 |  |  | 145,429 |
Less unvested awarded performance stock included in weighted average number of common shares outstanding – basic | (3,417 | ) |  | (3,819 | )
Weighted average number of common shares outstanding for basic earnings per common share | 139,360 |  |  | 141,610 |
Dilutive effect of stock options | 2,127 |  |  | 1,699 |
Weighted average number of shares outstanding – diluted | 141,487 |  |  | 143,309 |
Net income per share: |  |  |
Basic | $ | 0.40 |  |  | $ | 0.36 |
Diluted | $ | 0.39 |  |  | $ | 0.36 |

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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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