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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Reconciliation of Weighted Average Common Shares Outstanding | A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows:
| Three months ended September 30 |  | Nine months ended September 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in thousands)
Weighted average shares outstanding (basic) | 174,338 |  |  | 186,109 |  |  | 176,399 |  |  | 187,893 |
Impact of common stock equivalents | 1,004 |  |  | 846 |  |  | 1,029 |  |  | 970 |
Weighted average shares outstanding (diluted) | 175,342 |  |  | 186,955 |  |  | 177,428 |  |  | 188,863 |

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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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