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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Net sales $ 1,986,968 $ 1,861,589 $ 4,819,935 $ 4,688,574
Cost of sales 1,702,478 1,589,105 4,195,965 4,002,072
Gross profit 284,490 272,484 623,970 686,502
Selling, general and administrative 83,211 80,753 211,541 262,379
Research and development 42,352 42,364 130,012 120,103
Total operating expenses 125,563 123,117 341,553 382,482
Operating income 158,927 149,367 282,417 304,020
Interest expense 21,231 15,622 54,850 47,866
Other (income) expense, net (16,701) (8,130) (35,833) (39,273)
Total other expense, net 4,530 7,492 19,017 8,593
Income before taxes 154,397 141,875 263,400 295,427
Income tax expense 27,715 19,185 59,813 45,693
Net income 126,682 122,690 203,587 249,734
Net income attributable to non-controlling interests (93) (121) (1,453) (1,371)
Net income attributable to Amkor $ 126,589 $ 122,569 $ 202,134 $ 248,363
Net income attributable to Amkor per common share:        
Basic (in dollars per share) $ 0.51 $ 0.50 $ 0.82 $ 1.01
Diluted (in dollars per share) $ 0.51 $ 0.49 $ 0.81 $ 1.00
Shares used in computing per common share amounts:        
Basic (in shares) 247,158 246,480 247,035 246,239
Diluted (in shares) 248,302 247,922 248,054 247,798