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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Beginning Balance at Dec. 31, 2015 $ 1,160,881 $ 113 $ 744,725 $ 427,214 $ (11,171)
Beginning Balance, Shares at Dec. 31, 2015   53,199,720      
Net issuance under stock-based plans 6,902   6,902    
Net issuance under stock-based plans, Shares   517,939      
Stock-based compensation 25,228   25,228    
Tax effect from stock-based plans 1,254   1,254    
Stock repurchase $ (1,545)   (627) (918)  
Stock repurchase, shares 44,798 (44,798)      
Cash dividend $ (36,361)     (36,361)  
Comprehensive income (net of tax):          
Net income 104,809     104,809  
Other comprehensive loss (19,376)       (19,376)
Ending Balance at Dec. 31, 2016 1,241,792 $ 113 777,482 494,744 (30,547)
Ending Balance, Shares at Dec. 31, 2016   53,672,861      
Net issuance under stock-based plans (12,216)   (12,216)    
Net issuance under stock-based plans, Shares   682,674      
Stock-based compensation $ 24,378   24,378    
Stock repurchase, shares 0        
Cash dividend $ (38,178)     (38,178)  
Comprehensive income (net of tax):          
Net income 339,132     339,132  
Other comprehensive loss 33,999       33,999
Ending Balance at Dec. 31, 2017 1,588,907 $ 113 789,644 795,698 3,452
Ending Balance, Shares at Dec. 31, 2017   54,355,535      
Net issuance under stock-based plans (11,104)   (11,104)    
Net issuance under stock-based plans, Shares   502,150      
Stock-based compensation 27,262   27,262    
Stock repurchase $ (75,000)   (11,870) (63,130)  
Stock repurchase, shares 818,000 (818,131)      
Cash dividend $ (42,405)     (42,405)  
Accounting Standards Codification Topic 606 adjustment 1,738     1,738  
Comprehensive income (net of tax):          
Net income 392,896     392,896  
Other comprehensive loss (9,107)       (9,107)
Ending Balance at Dec. 31, 2018 $ 1,873,187 $ 113 $ 793,932 $ 1,084,797 $ (5,655)
Ending Balance, Shares at Dec. 31, 2018   54,039,554