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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
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
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Weighted average shares outstanding (basic) | 175,764 |  |  | 174,597 |  |  | 175,535 |  |  | 174,375 |
Impact of common stock equivalents | 1,080 |  |  | 935 |  |  | 1,171 |  |  | 1,179 |
Weighted average shares outstanding (diluted) | 176,844 |  |  | 175,532 |  |  | 176,706 |  |  | 175,554 |

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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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