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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, 2013 $ 1,348,549 $ 996 $ (5,362) $ 985,023 $ 367,892
Balance, shares at Dec. 31, 2013   100,699 167    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Fees (2013 issuance of common stock) (176)     (176)  
Stock-based compensation 10,180     10,180  
Stock-based compensation, shares   531      
Vesting of restricted shares   3   (3)  
Treasury stock – tax withholdings (3,315)   (3,315)    
Treasury stock - tax withholdings, shares   (78) 78    
Net income 208,786       208,786
Balance at Jun. 30, 2014 $ 1,564,024 $ 999 $ (8,677) $ 995,024 $ 576,678
Balance, shares at Jun. 30, 2014   101,152 245