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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 16,581     16,581  
Stock-based compensation, shares   748      
Vesting of restricted shares   4   (4)  
Treasury stock – tax withholdings (5,240)   (5,240)    
Treasury stock - tax withholdings, shares   (116) 116    
Net income 330,373       330,373
Balance at Sep. 30, 2014 $ 1,690,087 $ 1,000 $ (10,602) $ 1,001,424 $ 698,265
Balance, shares at Sep. 30, 2014   101,331 283