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Weighted Average Shares | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Weighted Average Shares | Weighted Average Shares Weighted-average shares were calculated as follows (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Basic weighted-average common shares outstanding | 172,333 |  |  | 173,287 |  |  | 170,676 |
Effect of dilutive stock options | 5,073 |  |  | 6,264 |  |  | 3,468 |
Diluted weighted-average common and common-equivalent shares outstanding | 177,406 |  |  | 179,551 |  |  | 174,144 |
Stock options to purchase 2,650,164, 3,363,141, and 4,391,598 shares of common stock, on a weighted-average basis, were outstanding in 2018, 2017, and 2016, 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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