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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2016
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
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in thousands)
Weighted average shares outstanding (basic) | 173,394 |  |  | 176,433 |  |  | 173,363 |  |  | 177,446 |
Impact of common stock equivalents | 924 |  |  | 1,098 |  |  | 1,004 |  |  | 1,042 |
Weighted average shares outstanding (diluted) | 174,318 |  |  | 177,531 |  |  | 174,367 |  |  | 178,488 |

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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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