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Weighted-Average Shares | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Weighted-Average Shares | Weighted-Average Shares Weighted-average shares were calculated as follows (in thousands):
| Three-months Ended
| March 31, 2019 |  | April 1, 2018
Basic weighted-average common shares outstanding | 171,098 |  |  | 173,280 |
Effect of dilutive stock options | 4,509 |  |  | 6,361 |
Weighted-average common and common-equivalent shares outstanding | 175,607 |  |  | 179,641 |
Stock options to purchase 4,832,000 and 1,339,000 shares of common stock, on a weighted-average basis, were outstanding during the three-month periods ended March 31, 2019 and April 1, 2018, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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