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Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2012 $ 795,005 $ 925 $ (3,796) $ 657,943 $ 139,933
Balance, shares at Dec. 31, 2012   93,303 129    
Stock-based compensation 2,407     2,407  
Stock-based compensation, shares   298      
Treasury stock - tax withholdings (156)   (156)    
Treasury stock - tax withholdings, shares   (5) 5    
Net income 51,851       51,851
Balance at Mar. 31, 2013 $ 849,107 $ 925 $ (3,952) $ 660,350 $ 191,784
Balance, shares at Mar. 31, 2013   93,596 134