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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   43 722    
Net income 25,734     25,734  
Net change (2,485)       (2,485)
Tax effect of stock options     199    
Dividends on common stock       (8,235)  
Stock-based compensation arrangements     798    
Shares acquired and canceled   (7)   (249)  
Balance at end of period at Jun. 30, 2012 499,561 15,154 79,181 398,267 6,959
Balance at beginning of period at Mar. 31, 2012   15,145 78,420 390,881 7,511
Shares issued   16 267    
Net income 11,729     11,729  
Net change (552)       (552)
Tax effect of stock options     137    
Dividends on common stock       (4,094)  
Stock-based compensation arrangements     357    
Shares acquired and canceled   (7)   (249)  
Balance at end of period at Jun. 30, 2012 499,561 15,154 79,181 398,267 6,959
Balance at beginning of period at Dec. 31, 2012 519,567 15,242 82,401 415,607 6,317
Shares issued   59 1,028    
Net income 25,965     25,965  
Net change (2,092)       (2,092)
Tax effect of stock options     236    
Dividends on common stock       (8,833)  
Stock-based compensation arrangements     695    
Shares acquired and canceled   (45)   (1,619)  
Balance at end of period at Jun. 30, 2013 534,961 15,256 84,360 431,120 4,225
Balance at beginning of period at Mar. 31, 2013   15,228 82,956 423,637 5,886
Shares issued   50 870    
Net income 12,593     12,593  
Net change (1,661)       (1,661)
Tax effect of stock options     213    
Dividends on common stock       (4,411)  
Stock-based compensation arrangements     321    
Shares acquired and canceled   (22)   (699)  
Balance at end of period at Jun. 30, 2013 $ 534,961 $ 15,256 $ 84,360 $ 431,120 $ 4,225