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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, Shares at Dec. 31, 2015   31,194,892      
Balance at beginning of period at Dec. 31, 2015   $ 31,194 $ 87,268 $ 535,521 $ 1,527
Shares issued for stock options, Shares   626,978      
Shares issued for stock options, Value   $ 628 9,305    
Net income $ 70,674     70,674  
Net change $ (1,433)       (1,433)
Tax effect of stock options     3,521    
Dividends on common stock       (23,124)  
Stock-based compensation arrangements     1,636    
Shares acquired and canceled, Shares   (200,000)      
Shares acquired and canceled, Value   $ (200)   (5,423)  
Balance at end of period, Shares at Dec. 31, 2016 31,621,870 31,621,870      
Balance at end of period at Dec. 31, 2016 $ 711,094 $ 31,622 101,730 577,648 94
Shares issued for stock options, Shares   272,693      
Shares issued for stock options, Value   $ 273 4,571    
Net income 86,439     86,439  
Net change $ (2,421)       (2,421)
Dividends on common stock       (25,507)  
Stock-based compensation arrangements     1,180    
Balance at end of period, Shares at Dec. 31, 2017 31,894,563 31,894,563      
Balance at end of period at Dec. 31, 2017 $ 775,629 $ 31,895 107,481 638,580 (2,327)
Shares issued for stock options, Shares   127,816      
Shares issued for stock options, Value   $ 127 2,111    
Shares issued for acquisitions, Shares   732,811      
Shares issued for acquisitions, Value   $ 733 38,765    
Net income 125,814     125,814  
Net change $ (430)       (430)
Dividends on common stock       (33,398)  
Stock-based compensation arrangements     1,352    
Shares acquired and canceled, Shares   (151,264)      
Shares acquired and canceled, Value   $ (151)   (7,763)  
Cumulative effect of change in accounting principle       (618) 618
Balance at end of period, Shares at Dec. 31, 2018 32,603,926 32,603,926      
Balance at end of period at Dec. 31, 2018 $ 902,789 $ 32,604 $ 149,709 $ 722,615 $ (2,139)