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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 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 (8,920)   (8,920)    
Net issuance under stock-based plans, Shares   136,568      
Stock-based compensation 10,426   10,426    
Cash dividend (9,808)     (9,808)  
Comprehensive income (net of tax):          
Net income 105,121     105,121  
Other comprehensive gain 10,805       10,805
Ending Balance at Mar. 31, 2018 1,698,340 $ 113 791,150 892,820 14,257
Ending Balance, Shares at Mar. 31, 2018   54,492,103      
Accounting standards codification topic 606 adjustment 1,809     1,809  
Beginning Balance at Dec. 31, 2018 1,873,187 $ 113 793,932 1,084,797 (5,655)
Beginning Balance, Shares at Dec. 31, 2018   54,039,554      
Net issuance under stock-based plans 22,491   22,491    
Net issuance under stock-based plans, Shares   192,218      
Stock-based compensation 27,838   27,838    
Cash dividend (10,843)     (10,843)  
Comprehensive income (net of tax):          
Net income 12,455     12,455  
Other comprehensive gain (4,267)       (4,267)
Ending Balance at Mar. 31, 2019 $ 1,920,861 $ 113 $ 844,261 $ 1,086,409 $ (9,922)
Ending Balance, Shares at Mar. 31, 2019   54,231,772