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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Earnings and Weighted Average Number of Ordinary Shares Outstanding in Computation of Earnings Per Share | The earnings and weighted average number of ordinary shares outstanding in the computation of earnings per share were as follows: Net profit for the year
|  | For the Year Ended December 31
|  | 2015 |  | 2016 (Retrospectively Adjusted) |  | 2017
|  | NT$ |  | NT$ |  | NT$ |  | US$ (Note 4)
Profit for the year attributable to owners of the Company |  | $ | 19,732,148 |  |  | $ | 21,324,423 |  |  | $ | 22,819,119 |  |  | $ | 769,876 |
Effect of potentially dilutive ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee share options issued by subsidiaries |  |  | - |  |  |  | (374,359 | ) |  |  | (813,627 | ) |  |  | (27,450 | )
Investments in associates |  |  | (210,126 | ) |  |  | (494,388 | ) |  |  | (367,687 | ) |  |  | (12,405 | )
Convertible bonds |  |  | 901,187 |  |  |  | (1,165,506 | ) |  |  | 93,781 |  |  |  | 3,164 |
Earnings used in the computation of diluted earnings per share |  | $ | 20,423,209 |  |  | $ | 19,290,170 |  |  | $ | 21,731,586 |  |  | $ | 733,185 |
Weighted average number of ordinary shares outstanding (in thousand shares):
|  | For the Year Ended December 31
|  | 2015 |  | 2016 |  | 2017
Weighted average number of ordinary shares in computation of basic earnings per share |  |  | 7,652,773 |  |  |  | 7,662,870 |  |  |  | 8,160,887 |
Effect of potentially dilutive ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |
Convertible bonds |  |  | 455,671 |  |  |  | 515,295 |  |  |  | 124,911 |
Employee share options |  |  | 86,994 |  |  |  | 59,218 |  |  |  | 39,868 |
Employees’ compensation |  |  | 54,626 |  |  |  | 46,746 |  |  |  | 43,574 |
Weighted average number of ordinary shares in computation of diluted earnings per share |  |  | 8,250,064 |  |  |  | 8,284,129 |  |  |  | 8,369,240 |

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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