Rendering
| Component: (Network and Table) |
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| Network | 2306301 - Disclosure - Share-Based Compensation Plans (Tables) (http://www.amkor.com/role/ShareBasedCompensationPlansTables) |
| Table | (Implied) |
Slicers (applies to each fact value in each table cell)
| Reporting Entity [Axis] | 0001047127 (http://www.sec.gov/CIK) |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | Period [Axis] |
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2016-01-01 - 2016-12-31 |
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
Summary of all common stock option activity | The following table summarizes our stock option activity for the year ended December 31, 2016: | | | | | | | | | | | | | | Number of Shares (In thousands) | | Weighted-Average Exercise Price per Share | | Weighted-Average Remaining Contractual Term (Years) | | Aggregate Intrinsic Value (In thousands) | Outstanding at December 31, 2015 | 3,727 | | $ | 6.49 |
| | | | | Granted | 460 | | 6.08 |
| | | | | Exercised | (1,470) | | 5.61 |
| | | | | Forfeited or expired | (274) | | 6.63 |
| | | | | Outstanding at December 31, 2016 | 2,443 | | $ | 6.93 |
| | 5.99 | | $ | 9,174 |
| Fully vested at December 31, 2016 and expected to vest thereafter | 2,416 | | $ | 6.94 |
| | 5.96 | | $ | 9,066 |
| Exercisable at December 31, 2016 | 1,531 | | $ | 7.53 |
| | 4.57 | | $ | 4,963 |
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Assumptions used in valuing the weighted average fair values of the options granted |
The following assumptions were used to calculate the weighted-average fair values of the options granted: | | | | | | | | | | | | | | For the Year Ended December 31, | | 2016 | | 2015 | | 2014 | Expected life (in years) | 6.5 |
| | 5.8 |
| | 6.1 |
| Risk-free interest rate | 1.5 | % | | 1.8 | % | | 2.0 | % | Volatility | 48 | % | | 45 | % | | 57 | % | Dividend yield | — |
| | — |
| | — |
| Weighted-average grant date fair value per option granted | $ | 2.89 |
| | $ | 3.14 |
| | $ | 4.46 |
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Restricted share activity | The following table summarizes our restricted share activity for the year ended December 31, 2016: | | | | | | | | | Number of Shares (In thousands) | | Weighted- average Grant Date Fair Value (Per Share) | Nonvested at December 31, 2015 | 385 |
| | $ | 4.78 |
| Awards granted | 50 |
| | 5.66 |
| Awards vested | (285 | ) | | 4.82 |
| Awards forfeited | (5 | ) | | 4.43 |
| Nonvested at December 31, 2016 | 145 |
| | $ | 5.02 |
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