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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, 2012 $ 1,012,156 $ 113 $ 718,005 $ 278,583 $ 15,455
Beginning Balance, Shares at Dec. 31, 2012   52,748,849      
Net issuance under stock-based plans (464)   (464)    
Net issuance under stock-based plans, Shares   721,601      
Stock-based compensation 13,992   13,992    
Tax effect from stock-based plans 495   495    
Stock repurchase (2,875)   (1,457) (1,418)  
Stock repurchase, Shares   (107,000)      
Cash dividend (33,975)     (33,975)  
Comprehensive income (net of tax):          
Net issuance under stock-based plans (464)   (464)    
Net issuance under stock-based plans, Shares   721,601      
Stock-based compensation 13,992   13,992    
Tax effect from stock-based plans 495   495    
Stock repurchase (2,875)   (1,457) (1,418)  
Stock repurchase, Shares   (107,000)      
Cash dividend (33,975)     (33,975)  
Net income 35,776     35,776  
Other comprehensive loss (3,582)       (3,582)
Ending Balance at Dec. 31, 2013 1,021,523 $ 113 730,571 278,966 11,873
Ending Balance, Shares at Dec. 31, 2013   53,363,450      
Ending Balance, Shares at Dec. 31, 2013   53,363,450      
Net issuance under stock-based plans 2,492   2,492    
Net issuance under stock-based plans, Shares   519,128      
Stock-based compensation 11,315   11,315    
Tax effect from stock-based plans 331   331    
Stock repurchase $ (20,809)   (9,977) (10,832)  
Stock repurchase, Shares (727,912) (727,912)      
Cash dividend $ (34,851)     (34,851)  
Comprehensive income (net of tax):          
Net issuance under stock-based plans 2,492   2,492    
Net issuance under stock-based plans, Shares   519,128      
Stock-based compensation 11,315   11,315    
Tax effect from stock-based plans 331   331    
Stock repurchase $ (20,809)   (9,977) (10,832)  
Stock repurchase, Shares (727,912) (727,912)      
Cash dividend $ (34,851)     (34,851)  
Net income 115,778     115,778  
Other comprehensive loss (13,957)       (13,957)
Ending Balance at Dec. 31, 2014 1,081,822 $ 113 734,732 349,061 (2,084)
Ending Balance, Shares at Dec. 31, 2014   53,154,666      
Ending Balance, Shares at Dec. 31, 2014   53,154,666      
Net issuance under stock-based plans 1,262   1,262    
Net issuance under stock-based plans, Shares   414,187      
Stock-based compensation 13,013   13,013    
Tax effect from stock-based plans 837   837    
Stock repurchase $ (13,294)   (5,119) (8,175)  
Stock repurchase, Shares (369,133) (369,133)      
Cash dividend $ (35,969)     (35,969)  
Comprehensive income (net of tax):          
Net issuance under stock-based plans 1,262   1,262    
Net issuance under stock-based plans, Shares   414,187      
Stock-based compensation 13,013   13,013    
Tax effect from stock-based plans 837   837    
Stock repurchase $ (13,294)   (5,119) (8,175)  
Stock repurchase, Shares (369,133) (369,133)      
Cash dividend $ (35,969)     (35,969)  
Net income 122,297     122,297  
Other comprehensive loss (9,087)       (9,087)
Ending Balance at Dec. 31, 2015 $ 1,160,881 $ 113 $ 744,725 $ 427,214 $ (11,171)
Ending Balance, Shares at Dec. 31, 2015   53,199,720      
Ending Balance, Shares at Dec. 31, 2015   53,199,720