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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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 years ended December 31:
(in thousands, except per share data) | 2017 |  | 2016 |  | 2015
Net income | $ | 399,630 |  |  | $ | 257,491 |  |  | $ | 243,318 |
Net income attributable to unvested awarded performance stock | (9,746 | ) |  | (6,705 | ) |  | (5,695 | )
Net income attributable to common shares | $ | 389,884 |  |  | $ | 250,786 |  |  | $ | 237,623 |
Weighted-average number of common shares outstanding – basic | 139,697 |  |  | 139,779 |  |  | 141,113 |
Less unvested awarded performance stock included in weighted-average number of common shares outstanding – basic | (3,407 | ) |  | (3,640 | ) |  | (3,303 | )
Weighted-average number of common shares outstanding for basic earnings per common share | 136,290 |  |  | 136,139 |  |  | 137,810 |
Dilutive effect of stock options | 2,503 |  |  | 1,665 |  |  | 2,302 |
Weighted-average number of shares outstanding – diluted | 138,793 |  |  | 137,804 |  |  | 140,112 |
Net income per share: |  |  |  |  |
Basic | $ | 2.86 |  |  | $ | 1.84 |  |  | $ | 1.72 |
Diluted | $ | 2.81 |  |  | $ | 1.82 |  |  | $ | 1.70 |

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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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