Amkor Technology, Inc. (NDAQ: AMKR) added more than 20% to its shares midday Thursday after releasing impressive first quarter results. The Arizona-based semiconductor assembly company had net income more than double to $72 million, or 36 cents per share, from $34.6 million, or 18 cents per share, a year earlier.

These results handily beat Wall Street earning expectations of 26 cents per share - though Amkor sales missed expectations by about $1 million, coming in at $699.5 million. The strong earnings were a result of increased wireless sales and favorably currency exchange rates.

“We exceeded our sales and profitability targets for the first quarter due to select customer demand in certain wireless communications and networking applications, which partially offset the overall seasonal slowing that we had expected. Our first quarter net income included an approximately $9.5 million foreign currency gain principally due to the depreciation of the Korean won and the resulting remeasurement of our Korean employee benefit plan liability," sand CEO and Chairman James Kim.

The company also made strides by repaying over $100 million of debt in the first quarter - though the company still carries more than $1.6 billion of debt, this and previous pay-downs lowered interest expenses by 21% from a year earlier. Amkor expects net income for the second quarter of the year to be 32 cents to 36 cents per share.

Even with Thursday's gains, Amkor shares are significantly lower than their 52 week high of over $16 per share. As of publication, shares were up 21.62% to $11.61 per share.

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