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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - 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, 2022     291,249          
Balance at beginning 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 beginning of period, treasury stock (in shares) at Mar. 31, 2023             (46,269)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 45,224 45,351     45,351     (127)
Other comprehensive income (loss) (1,609) (1,609)       (1,609)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (111)  
Treasury stock acquired through surrender of shares for tax withholding (2,823) (2,823)         $ (2,823)  
Issuance of stock through share-based compensation plans (in shares)     565          
Issuance of stock through share-based compensation plans 1,524 1,524 $ 1 1,523        
Share-based compensation 3,708 3,708   3,708        
Cash Dividends declared (18,426) (18,426)     (18,426)      
Subsidiary dividends to non-controlling interests (136)             (136)
Balance at end of period, common stock (in shares) at Mar. 31, 2023     291,814          
Balance at end of period at Mar. 31, 2023 $ 3,727,163 3,696,477 $ 292 2,001,575 1,901,569 15,090 $ (222,049) 30,686
Balance at end of period, treasury stock (in shares) at Dec. 31, 2022             (46,158)  
Balance at beginning of period, common stock (in shares) at Dec. 31, 2023 245,888   292,167          
Balance at beginning 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 beginning of period, treasury stock (in shares) at Mar. 31, 2024 (46,340)           (46,340)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 59,786 58,897     58,897     889
Other comprehensive income (loss) (9,440) (9,440)       (9,440)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (61)  
Treasury stock acquired through surrender of shares for tax withholding (1,822) (1,822)         $ (1,822)  
Issuance of stock through share-based compensation plans (in shares)     327          
Issuance of stock through share-based compensation plans 1,356 1,356   1,356        
Share-based compensation 5,256 5,256   5,256        
Cash Dividends declared (19,428) (19,428)     (19,428)      
Subsidiary dividends to non-controlling interests $ (135)             (135)
Balance at end of period, common stock (in shares) at Mar. 31, 2024 246,154   292,494          
Balance at end of period at Mar. 31, 2024 $ 4,030,608 $ 3,997,127 $ 292 $ 2,014,782 $ 2,199,300 $ 6,910 $ (224,157) $ 33,481
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023 (46,279)           (46,279)