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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)
In Thousands, unless otherwise specified
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    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 5,602     5,602  
Stock-based compensation, shares   261      
Treasury stock – tax withholdings (364)   (364)    
Treasury stock - tax withholdings, shares   (10) 10    
Net income 118,970       118,970
Balance at Jun. 30, 2013 $ 919,213 $ 925 $ (4,160) $ 663,545 $ 258,903
Balance, shares at Jun. 30, 2013   93,554 139