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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Ordinary Shares
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings (accumulated deficit)
Treasury Stock
Beginning Balance at Dec. 31, 2017 $ 494,051 $ 1,431 $ 242,487 $ 2,643 $ 247,490  
Beginning Balance, shares at Dec. 31, 2017   143,162        
Net income 98,070       98,070  
Other comprehensive income (loss) (2,148)     (2,148)    
Stock-based compensation expenses 20,779   20,779      
Issuance of ordinary shares upon exercise of restricted stock units, shares   1,517        
Issuance of ordinary shares upon exercise of restricted stock units (20) $ 16 (36)      
Share repurchase (34,755)         $ (34,755)
Dividends declared (43,700)       (43,700)  
Ending Balance at Dec. 31, 2018 532,277 $ 1,447 263,230 495 301,860 (34,755)
Ending Balance, shares at Dec. 31, 2018   144,679        
Net income 64,398       64,398  
Other comprehensive income (loss) (1,280)     (1,280)    
Stock-based compensation expenses 14,591   14,591      
Issuance of ordinary shares upon exercise of restricted stock units, shares   1,505        
Issuance of ordinary shares upon exercise of restricted stock units (22) $ 15 (37)      
Share repurchase (25,103)         (25,103)
Treasury stock retired (Shares)   (7,074)        
Treasury stock retired   $ (71) (12,574)   (47,213) 59,858
Dividends declared (48,077)       (48,077)  
Ending Balance at Dec. 31, 2019 $ 536,784 $ 1,391 265,210 (785) 270,968  
Ending Balance, shares at Dec. 31, 2019 139,110 139,110        
Net income $ 79,746       79,746  
Other comprehensive income (loss) 436     436    
Stock-based compensation expenses 14,589   14,589      
Issuance of ordinary shares upon exercise of restricted stock units, shares   1,564        
Issuance of ordinary shares upon exercise of restricted stock units (22) $ 16 (38)      
Share repurchase (25,044)         (25,044)
Treasury stock retired (Shares)   (2,506)        
Treasury stock retired   $ (25) (4,629)   (20,390) $ 25,044
Dividends declared (48,747)       (48,747)  
Ending Balance at Dec. 31, 2020 $ 557,742 $ 1,382 $ 275,132 $ (349) $ 281,577  
Ending Balance, shares at Dec. 31, 2020 138,168 138,168