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Debt (Tables) | 6 Months Ended
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Jun. 30, 2024
Debt Disclosure [Abstract] |
Schedule of Short-Term Borrowings and Long-Term Debt | Following is a summary of short-term borrowings and long-term debt:
| June 30, 2024 |  | December 31, 2023
| (In thousands)
Debt of Amkor Technology, Inc.: |  |  |
Senior notes: |  |  |
6.625% Senior notes, due September 2027 | $ | 525,000 |  |  | $ | 525,000 |
Debt of subsidiaries: |  |  |
Amkor Technology Korea, Inc.: |  |  |
Term loan, fixed rate at 3.95%, due May 2027 (1) | — |  |  | — |
Term loan, fixed rate at 2.12%, due December 2028 | 200,000 |  |  | 200,000 |
Amkor Technology Japan, Inc.: |  |  |
Short-term term loans, variable rate (2) | 1,579 |  |  | 5,098 |
Term loan, fixed rate at 1.35%, due December 2024 | 17,715 |  |  | 40,414 |
Term loan, fixed rate at 1.20%, due December 2025 | 20,326 |  |  | 30,913 |
Term loan, fixed rate at 1.23%, due December 2026 | 40,714 |  |  | 55,729 |
Term loan, fixed rate at 1.59%, due December 2027 | 68,312 |  |  | 89,053 |
Term loan, fixed rate at 1.80%, due December 2028 | 97,899 |  |  | 124,078 |
Amkor Assembly & Test (Shanghai) Co., Ltd.: |  |  |
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of June 30, 2024, due June 2025 | 36,000 |  |  | 37,000 |
Term loans, SOFR plus 0.75%, weighted average of 6.06% as of June 30, 2024, due 2025 | 56,500 |  |  | 57,500 |
Term loans, SOFR plus 0.95%, due December 2026 (3) | 44,500 |  |  | 45,000 |
Other: |  |  |
Credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) (4) | — |  |  | — |
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5) | — |  |  | — |
| 1,108,545 |  |  | 1,209,785 |
Less: Unamortized discount and deferred debt costs, net | (4,822) |  |  | (6,329) |
Less: Short-term borrowings and current portion of long-term debt | (154,403) |  |  | (131,624) |
Long-term debt | $ | 949,320 |  |  | $ | 1,071,832 |
(1)In April 2021, we entered into a ₩80.0 billion term loan agreement with the option to borrow and re-borrow the funds up to six times per year through April 2024 at a fixed rate of 1.85%. In May 2024, we replaced this loan by entering into a ₩80.0 billion (approximately $59 million) term loan agreement with the option to borrow and re-borrow the funds up to six times per year through May 2027. Principal is payable at maturity, and interest is payable monthly, at a fixed rate of 3.95%. During the six months ended June 30, 2024, we borrowed $58.7 million, which we immediately repaid. As of June 30, 2024, ₩80.0 billion, or approximately $58 million, was available to be drawn. (2)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. Interest as of June 30, 2024 is at an annual base rate equal to the Tokyo Interbank Offered Rate plus 0.18% to 0.20% (weighted average of 0.38% as of June 30, 2024). As of June 30, 2024, $4.0 million was available to be drawn. (3)In February 2024, Amkor Assembly & Test (Shanghai) Co. Ltd. amended the term loan due December 2026 to reduce the interest rate from SOFR plus 1.40% to SOFR plus 0.95% (weighted average of 6.30% as of June 30, 2024). This contractual amendment is treated as a modification with no recognized gain or loss. (4)In March 2022, Amkor Technology Taiwan Ltd. (“ATT”) amended an existing revolving credit facility to reduce availability from $36.0 million to $15.0 million. As of June 30, 2024, $15.0 million was available for future borrowings under such credit facility. (5)In March 2022, Amkor Technology Singapore Holdings Pte. Ltd. (“ATSH”) entered into a $600.0 million senior secured revolving credit facility (the “2022 Singapore Revolver”), which is guaranteed by Amkor Technology, Inc., ATT and Amkor Advanced Technology, Inc. (“AATT”). The maximum borrowing capacity under the 2022 Singapore Revolver is limited to a base amount equal to the lesser of: (1) $600.0 million; or (2) $250.0 million plus a variable amount equal to 37.5% of our consolidated accounts receivable balance. As of June 30, 2024, $600.0 million was available for future borrowings under the 2022 Singapore Revolver.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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