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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
COMMON STOCK [Member]
CAPITAL SURPLUS [Member]
RETAINED EARNINGS [Member]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
Balance at beginning of period at Dec. 31, 2018   $ 32,604 $ 149,709 $ 722,615 $ (2,139)
Shares issued for stock options   36 745    
Net income $ 66,004     66,004  
Dividends on common stock       (19,529)  
Stock-based compensation arrangements     541    
Net change         5,794
Balance at end of period at Jun. 30, 2019 956,380 32,640 150,995 769,090 3,655
Balance at beginning of period at Mar. 31, 2019   32,618 150,195 744,713 401
Shares issued for stock options   22 433    
Net income 34,167     34,167  
Dividends on common stock       (9,790)  
Stock-based compensation arrangements     367    
Net change         3,254
Balance at end of period at Jun. 30, 2019 956,380 32,640 150,995 769,090 3,655
Balance at beginning of period at Dec. 31, 2019 1,004,989 32,694 153,353 815,488 3,454
Shares issued for stock options   28 507    
Shares acquired and canceled   (59)   (3,039)  
Net income 43,338     43,338  
Cumulative effect of change in accounting principle, net of tax of $925 (Note 1)       2,270  
Dividends on common stock       (20,903)  
Stock-based compensation arrangements     832    
Net change         6,236
Balance at end of period at Jun. 30, 2020 1,034,199 32,663 154,692 837,154 9,690
Balance at beginning of period at Mar. 31, 2020   32,647 153,999 826,855 9,879
Shares issued for stock options   16 287    
Net income 20,730     20,730  
Dividends on common stock       (10,431)  
Stock-based compensation arrangements     406    
Net change         (189)
Balance at end of period at Jun. 30, 2020 $ 1,034,199 $ 32,663 $ 154,692 $ 837,154 $ 9,690