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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Total Amkor Stockholders’ Equity
Common Stock
Additional Paid- In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Noncontrolling Interest in Subsidiaries
Balance at beginning of period, common stock (in shares) at Dec. 31, 2021     290,466          
Balance at beginning of period at Dec. 31, 2021 $ 2,972,546 $ 2,942,276 $ 290 $ 1,977,134 $ 1,163,939 $ 19,978 $ (219,065) $ 30,270
Balance at beginning of period, treasury stock (in shares) at Dec. 31, 2021             (46,151)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 767,042 765,823     765,823     1,219
Other comprehensive income (loss) (3,279) (3,279)       (3,279)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (7)  
Treasury stock acquired through surrender of shares for tax withholding (161) (161)         $ (161)  
Issuance of stock through share-based compensation plans (in shares)     783          
Issuance of stock through share-based compensation plans 5,649 5,649 $ 1 5,648        
Share-based compensation 13,562 13,562   13,562        
Cash dividends declared (55,118) (55,118)     (55,118)      
Subsidiary dividends to noncontrolling interests (540)             (540)
Balance at end of period, common stock (in shares) at Dec. 31, 2022     291,249          
Balance at end of period at Dec. 31, 2022 3,699,701 3,668,752 $ 291 1,996,344 1,874,644 16,699 $ (219,226) 30,949
Balance at end of period, treasury stock (in shares) at Dec. 31, 2022             (46,158)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 362,131 359,813     359,813     2,318
Other comprehensive income (loss) (349) (349)       (349)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (121)  
Treasury stock acquired through surrender of shares for tax withholding (3,109) (3,109)         $ (3,109)  
Issuance of stock through share-based compensation plans (in shares)     918          
Issuance of stock through share-based compensation plans 3,550 3,550 $ 1 3,549        
Share-based compensation 8,277 8,277   8,277        
Cash dividends declared (74,626) (74,626)     (74,626)      
Subsidiary dividends to noncontrolling interests $ (540)             (540)
Balance at end of period, common stock (in shares) at Dec. 31, 2023 245,888   292,167          
Balance at end of period at Dec. 31, 2023 $ 3,995,035 3,962,308 $ 292 2,008,170 2,159,831 16,350 $ (222,335) 32,727
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023 (46,279)           (46,279)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 355,535 354,012     354,012     1,523
Other comprehensive income (loss) (8,840) (8,840)       (8,840)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (89)  
Treasury stock acquired through surrender of shares for tax withholding (2,698) (2,698)         $ (2,698)  
Issuance of stock through share-based compensation plans (in shares)     885          
Issuance of stock through share-based compensation plans 5,103 5,103 $ 1 5,102        
Share-based compensation 18,371 18,371   18,371        
Cash dividends declared (178,711) (178,711)     (178,711)      
Subsidiary dividends to noncontrolling interests $ (630)             (630)
Balance at end of period, common stock (in shares) at Dec. 31, 2024 246,684   293,052          
Balance at end of period at Dec. 31, 2024 $ 4,183,165 $ 4,149,545 $ 293 $ 2,031,643 $ 2,335,132 $ 7,510 $ (225,033) $ 33,620
Balance at end of period, treasury stock (in shares) at Dec. 31, 2024 (46,368)           (46,368)