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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Capital Stock [Abstract] |
Weighted-Average Common Shares Outstanding | The following is a reconciliation of the weighted-average common shares outstanding for purposes of computing basic and diluted net income per share (in thousands):
|  | Year Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Basic weighted-average common shares outstanding |  |  | 57,997 |  |  |  | 55,412 |  |  |  | 52,806 |
Effect of dilutive securities: Stock awards and options |  |  | 1,060 |  |  |  | 683 |  |  |  | 1,110 |
Convertible note |  |  | — |  |  |  | 2 |  |  |  | 936 |
Diluted weighted-average common shares outstanding |  |  | 59,057 |  |  |  | 56,097 |  |  |  | 54,852 |

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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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