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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 Sep. 30, 2023             (46,269)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 243,119 242,251     242,251     868
Other comprehensive income (loss) (14,860) (14,860)       (14,860)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (111)  
Treasury stock acquired through surrender of shares for tax withholding (2,839) (2,839)         $ (2,839)  
Issuance of stock through share-based compensation plans (in shares)     784          
Issuance of stock through share-based compensation plans 2,285 2,285 $ 1 2,284        
Share-based compensation 6,398 6,398   6,398        
Cash dividends declared (55,299) (55,299)     (55,299)      
Subsidiary dividends to non-controlling interests (406)             (406)
Balance at end of period, common stock (in shares) at Sep. 30, 2023     292,033          
Balance at end of period at Sep. 30, 2023 3,878,099 3,846,688 $ 292 2,005,026 2,061,596 1,839 $ (222,065) 31,411
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 Jun. 30, 2023     291,958          
Balance at beginning of period at Jun. 30, 2023 3,762,859 3,732,150 $ 292 2,005,055 1,947,420 1,432 $ (222,049) 30,709
Balance at beginning of period, treasury stock (in shares) at Sep. 30, 2023             (46,269)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 133,451 132,614     132,614     837
Other comprehensive income (loss) 407 407       407    
Treasury stock acquired through surrender of shares for tax withholding (16) (16)         $ (16)  
Issuance of stock through share-based compensation plans (in shares)     75          
Issuance of stock through share-based compensation plans 360 360   360        
Share-based compensation (389) (389)   (389)        
Cash dividends declared (18,438) (18,438)     (18,438)      
Subsidiary dividends to non-controlling interests (135)             (135)
Balance at end of period, common stock (in shares) at Sep. 30, 2023     292,033          
Balance at end of period at Sep. 30, 2023 $ 3,878,099 3,846,688 $ 292 2,005,026 2,061,596 1,839 $ (222,065) 31,411
Balance at end of period, treasury stock (in shares) at Jun. 30, 2023             (46,269)  
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 Sep. 30, 2024 (46,362)           (46,362)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 249,734 248,363     248,363     1,371
Other comprehensive income (loss) (6,102) (6,102)       (6,102)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (83)  
Treasury stock acquired through surrender of shares for tax withholding (2,547) (2,547)         $ (2,547)  
Issuance of stock through share-based compensation plans (in shares)     825          
Issuance of stock through share-based compensation plans 4,708 4,708 $ 1 4,707        
Share-based compensation 15,147 15,147   15,147        
Cash dividends declared (58,256) (58,256)     (58,256)      
Subsidiary dividends to non-controlling interests $ (465)             (465)
Balance at end of period, common stock (in shares) at Sep. 30, 2024 246,630   292,992          
Balance at end of period at Sep. 30, 2024 $ 4,197,254 4,163,621 $ 293 2,028,024 2,349,938 10,248 $ (224,882) 33,633
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023 (46,279)           (46,279)  
Balance at beginning of period, common stock (in shares) at Jun. 30, 2024     292,642          
Balance at beginning of period at Jun. 30, 2024 $ 4,083,334 4,049,657 $ 293 2,022,512 2,246,795 4,214 $ (224,157) 33,677
Balance at beginning of period, treasury stock (in shares) at Sep. 30, 2024 (46,362)           (46,362)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 122,690 122,569     122,569     121
Other comprehensive income (loss) 6,034 6,034       6,034    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (22)  
Treasury stock acquired through surrender of shares for tax withholding (725) (725)         $ (725)  
Issuance of stock through share-based compensation plans (in shares)     350          
Issuance of stock through share-based compensation plans 1,892 1,892   1,892        
Share-based compensation 3,620 3,620   3,620        
Cash dividends declared (19,426) (19,426)     (19,426)      
Subsidiary dividends to non-controlling interests $ (165)             (165)
Balance at end of period, common stock (in shares) at Sep. 30, 2024 246,630   292,992          
Balance at end of period at Sep. 30, 2024 $ 4,197,254 $ 4,163,621 $ 293 $ 2,028,024 $ 2,349,938 $ 10,248 $ (224,882) $ 33,633
Balance at end of period, treasury stock (in shares) at Jun. 30, 2024             (46,340)