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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Shares Held Under Employee Participation Plan
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Accumulated Earnings
Balance at Dec. 31, 2011 $ 900,987 $ 532 $ (469) $ 497,919 $ 31,353 $ 371,652
Balance (in shares) at Dec. 31, 2011   53,183        
Increase (Decrease) in Stockholders' Equity            
Net income 55,441         55,441
Total other comprehensive income (2,277)       (2,277)  
Stock-based compensation 3,616     3,616    
Stock-based compensation (in shares)   71        
Issuance of restricted shares, net of shares remitted (1,216)     (1,216)    
Issuance of restricted shares, net of shares remitted (in shares)   (18)        
Exercise of stock options 98 1   97    
Exercise of stock options (in shares)   18        
Net tax benefit on exercise of stock options 1,121     1,121    
Net tax benefit on exercise of stock options   65        
Employee stock purchase plan 3,130     3,130    
Employee stock purchase plan (in shares)   0        
Balance at Jun. 30, 2012 $ 960,900 $ 533 $ (469) $ 504,667 $ 29,076 $ 427,093
Balance (in shares) at Jun. 30, 2012   53,319