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Weighted Average Shares | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Weighted Average Shares | Weighted Average Shares Weighted-average shares were calculated as follows (in thousands):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Basic weighted-average common shares outstanding | 86,296 |  |  | 86,858 |  |  | 86,946 |
Effect of dilutive stock options | 1,695 |  |  | 2,213 |  |  | 1,955 |
Diluted weighted-average common and common-equivalent shares outstanding | 87,991 |  |  | 89,071 |  |  | 88,901 |
Stock options to purchase 3,035,078, 1,286,403, and 1,385,901 shares of common stock, on a weighted-average basis, were outstanding in 2015, 2014, and 2013, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive.

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