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Weighted-Average Shares | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Weighted-Average Shares | Weighted-Average Shares Weighted-average shares were calculated as follows (in thousands):
| Three-months Ended |  | Six-months Ended
| June 30, 2019 |  | July 1, 2018 |  | June 30, 2019 |  | July 1, 2018
Basic weighted-average common shares outstanding | 171,318 |  |  | 172,370 |  |  | 171,209 |  |  | 172,825 |
Effect of dilutive stock options | 4,130 |  |  | 4,779 |  |  | 4,319 |  |  | 5,593 |
Weighted-average common and common-equivalent shares outstanding | 175,448 |  |  | 177,149 |  |  | 175,528 |  |  | 178,418 |
Stock options to purchase 6,113,000 and 5,503,000 shares of common stock, on a weighted-average basis, were outstanding during the three-month and six-month periods ended June 30, 2019, respectively, and 2,959,000 and 2,032,000 for the same periods in 2018, 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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