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Weighted Average Shares (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Calculation of 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 |

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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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