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Condensed 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, 2017 $ 1,588,907 $ 113 $ 789,644 $ 795,698 $ 3,452
Beginning Balance, Shares at Dec. 31, 2017   54,355,535      
Net issuance under stock-based plans (13,641)   (13,641)    
Net issuance under stock-based plans, Shares   447,219      
Stock-based compensation 22,005   22,005    
Stock repurchase $ (75,000)   (11,870) (63,130)  
Stock repurchase, shares (818,000) (818,131)      
Cash dividend $ (31,608)     (31,608)  
Accounting Standards Codification Topic 606 adjustment | Accounting Standards Codification Topic 606 Adjustment [Member] 1,739     1,739  
Comprehensive income (net of tax):          
Net income 321,260     321,260  
Other comprehensive loss (3,369)       (3,369)
Ending Balance at Sep. 30, 2018 1,810,293 $ 113 786,138 1,023,959 83
Ending Balance, Shares at Sep. 30, 2018   53,984,623      
Beginning Balance at Jun. 30, 2018 1,801,438 $ 113 793,384 1,004,698 3,243
Beginning Balance, Shares at Jun. 30, 2018   54,787,153      
Net issuance under stock-based plans (589)   (589)    
Net issuance under stock-based plans, Shares   15,601      
Stock-based compensation 5,213   5,213    
Stock repurchase (75,000)   (11,870) (63,130)  
Stock repurchase, shares   (818,131)      
Cash dividend (10,859)     (10,859)  
Accounting Standards Codification Topic 606 adjustment | Accounting Standards Codification Topic 606 Adjustment [Member] (27)     (27)  
Comprehensive income (net of tax):          
Net income 93,277     93,277  
Other comprehensive loss (3,160)       (3,160)
Ending Balance at Sep. 30, 2018 $ 1,810,293 $ 113 $ 786,138 $ 1,023,959 $ 83
Ending Balance, Shares at Sep. 30, 2018   53,984,623