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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 (loss) 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      
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      
Stock repurchase $ (75,000)        
Stock repurchase, Shares 0        
Comprehensive income (net of tax):          
Net income $ 321,260        
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      
Accounting standards codification topic 606 adjustment 1,809     1,809  
Beginning Balance at Mar. 31, 2018 1,698,340 $ 113 791,150 892,820 14,257
Beginning Balance, Shares at Mar. 31, 2018   54,492,103      
Net issuance under stock-based plans (4,132)   (4,132)    
Net issuance under stock-based plans, Shares   295,050      
Stock-based compensation 6,366   6,366    
Cash dividend (10,942)     (10,942)  
Comprehensive income (net of tax):          
Net income 122,862     122,862  
Other comprehensive gain (loss) (11,014)       (11,014)
Ending Balance at Jun. 30, 2018 1,801,438 $ 113 793,384 1,004,698 3,243
Ending Balance, Shares at Jun. 30, 2018   54,787,153      
Accounting standards codification topic 606 adjustment (42)     (42)  
Net issuance under stock-based plans (588)   (588)    
Net issuance under stock-based plans, Shares   15,601      
Stock-based compensation 5,213   5,213    
Cash dividend (10,858)     (10,858)  
Stock repurchase $ (75,000)   (11,871) (63,129)  
Stock repurchase, Shares (818,131)        
Comprehensive income (net of tax):          
Net income $ 93,277     93,277  
Other comprehensive gain (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      
Accounting standards codification topic 606 adjustment (29)     (29)  
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 (loss) (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      
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      
Stock repurchase, Shares 0        
Comprehensive income (net of tax):          
Net income $ 97,622        
Ending Balance at Sep. 30, 2019 1,973,531 $ 113 856,437 1,149,457 (32,476)
Ending Balance, Shares at Sep. 30, 2019   54,496,664      
Beginning Balance at Mar. 31, 2019 1,920,861 $ 113 844,261 1,086,409 (9,922)
Beginning Balance, Shares at Mar. 31, 2019   54,231,772      
Net issuance under stock-based plans (2,113)   (2,113)    
Net issuance under stock-based plans, Shares   247,920      
Stock-based compensation 7,205   7,205    
Cash dividend (10,880)     (10,880)  
Stock dividends accrued     232 (232)  
Comprehensive income (net of tax):          
Net income 37,739     37,739  
Other comprehensive gain (loss) (7,325)       (7,325)
Ending Balance at Jun. 30, 2019 1,945,487 $ 113 849,585 1,113,036 (17,247)
Ending Balance, Shares at Jun. 30, 2019   54,479,692      
Net issuance under stock-based plans (629)   (629)    
Net issuance under stock-based plans, Shares   16,972      
Stock-based compensation 7,376   7,376    
Cash dividend $ (10,898)     (10,898)  
Stock repurchase, Shares 0        
Stock dividends accrued     105 (105)  
Other $ (4)     (4)  
Comprehensive income (net of tax):          
Net income 47,428     47,428  
Other comprehensive gain (loss) (15,229)       (15,229)
Ending Balance at Sep. 30, 2019 $ 1,973,531 $ 113 $ 856,437 $ 1,149,457 $ (32,476)
Ending Balance, Shares at Sep. 30, 2019   54,496,664