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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (USD $)
In Thousands
Total
COMMON STOCK [Member]
CAPITAL SURPLUS [Member]
RETAINED EARNINGS [Member]
ACCUMULATED OTHER COMPREHENSIVE INCOME [Member]
Balance at beginning of period at Dec. 31, 2011   $ 15,118 $ 77,462 $ 381,017 $ 9,444
Shares issued   89 1,470    
Net income 39,594     39,594  
Net change (2,739)       (2,739)
Tax effect of stock options     629    
Dividends on common stock       (12,630)  
Stock-based compensation arrangements     1,189    
Shares acquired and canceled   (7)   (249)  
Balance at end of period at Sep. 30, 2012 510,387 15,200 80,750 407,732 6,705
Balance at beginning of period at Jun. 30, 2012   15,154 79,181 398,267 6,959
Shares issued   46 748    
Net income 13,860     13,860  
Net change (254)       (254)
Tax effect of stock options     430    
Dividends on common stock       (4,395)  
Stock-based compensation arrangements     391    
Balance at end of period at Sep. 30, 2012 510,387 15,200 80,750 407,732 6,705
Balance at beginning of period at Dec. 31, 2012 519,567 15,242 82,401 415,607 6,317
Shares issued   122 2,745    
Net income 40,456     40,456  
Net change (2,449)       (2,449)
Tax effect of stock options     727    
Dividends on common stock       (13,579)  
Stock-based compensation arrangements     1,094    
Shares acquired and canceled   (66)   (2,644)  
Balance at end of period at Sep. 30, 2013 545,973 15,298 86,967 439,840 3,868
Balance at beginning of period at Jun. 30, 2013   15,256 84,360 431,120 4,225
Shares issued   63 1,717    
Net income 14,491     14,491  
Net change (357)       (357)
Tax effect of stock options     491    
Dividends on common stock       (4,746)  
Stock-based compensation arrangements     399    
Shares acquired and canceled   (21)   (1,025)  
Balance at end of period at Sep. 30, 2013 $ 545,973 $ 15,298 $ 86,967 $ 439,840 $ 3,868