|
Earnings Per Share Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
|
3 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2014
|
| Dilutive Securities Adjustments [Line Items] |
|
|
| Net income attributable to Amkor |
$ 28,781 |
$ 20,633 |
| Income allocated to participating securities |
68 |
105 |
| Net income available to Amkor common stockholders — basic |
28,713 |
20,528 |
| Adjustment for dilutive securities on net income: |
|
|
| Net income reallocated to participating securities |
0 |
3 |
| Net income attributable to Amkor — diluted |
28,713 |
21,438 |
| Weighted average shares outstanding — basic |
236,708 |
216,757 |
| Effect of dilutive securities: |
|
|
| Weighted average shares outstanding — diluted |
237,424 |
235,497 |
| Net income attributable to Amkor per common share: |
|
|
| Basic (in dollars per share) |
$ 0.12 |
$ 0.09 |
| Diluted (in dollars per share) |
$ 0.12 |
$ 0.09 |
| Convertible Senior Subordinated Notes Due April 2014 [Member] |
|
|
| Adjustment for dilutive securities on net income: |
|
|
| Interest on 6.0% convertible notes due 2014, net of tax |
$ 0 |
$ 907 |
| Effect of dilutive securities: |
|
|
| 6.0% convertible notes due 2014 |
0 |
18,631 |
| Net income attributable to Amkor per common share: |
|
|
| Debt Instrument, Interest Rate, Stated Percentage |
6.00% |
|
| Stock Options Dilutive Effect [Member] |
|
|
| Effect of dilutive securities: |
|
|
| Stock options |
716 |
109 |