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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2010 $ 847,039 $ 113 $ 663,792 $ 171,356 $ 11,778
Beginning Balance, Shares at Dec. 31, 2010   50,648,601      
Net issuance under stock-based plans 28,546   28,546    
Net issuance under stock-based plans, Shares   1,929,135      
Stock-based compensation 11,225   11,225    
Tax effect from stock-based plans 5,019   5,019    
Stock repurchase (2,007)   (1,163) (844)  
Stock repurchase, Shares   (85,788)      
Cash dividend (31,373)     (31,373)  
Comprehensive income (net of tax):          
Net income 129,731     129,731  
Other comprehensive income 1,832       1,832
Ending Balance at Dec. 31, 2011 990,012 113 707,419 268,870 13,610
Ending Balance, Shares at Dec. 31, 2011   52,491,948      
Net issuance under stock-based plans 1,564   1,564    
Net issuance under stock-based plans, Shares   691,501      
Stock-based compensation 13,031   13,031    
Tax effect from stock-based plans 1,862   1,862    
Stock repurchase (11,501)   (5,871) (5,630)  
Stock repurchase, Shares (434,600) (434,600)      
Cash dividend (32,686)     (32,686)  
Comprehensive income (net of tax):          
Net income 48,029     48,029  
Other comprehensive income 1,845       1,845
Ending Balance at Dec. 31, 2012 1,012,156 113 718,005 278,583 15,455
Ending 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) (107,000)      
Cash dividend (33,975)     (33,975)  
Comprehensive income (net of tax):          
Net income 35,776     35,776  
Other comprehensive income (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