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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30 |  | Six months ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in thousands)
Weighted average shares outstanding (basic) | 176,433 |  |  | 188,139 |  |  | 177,446 |  |  | 188,799 |
Impact of common stock equivalents | 1,098 |  |  | 1,043 |  |  | 1,042 |  |  | 1,033 |
Weighted average shares outstanding (diluted) | 177,531 |  |  | 189,182 |  |  | 178,488 |  |  | 189,832 |

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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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