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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, 2017   $ 31,895 $ 107,481 $ 638,580 $ (2,327)
Shares issued for stock options   122 2,015    
Shares issued for acquisitions   733 38,765    
Stock-based compensation arrangements     981    
Net income $ 93,089     93,089  
Cumulative effect of change in accounting principle       (618) 618
Dividends on common stock       (23,570)  
Net change (2,963)       (2,963)
Balance at end of period at Sep. 30, 2018 884,801 32,750 149,242 707,481 (4,672)
Balance at beginning of period at Jun. 30, 2018   32,731 148,494 684,425 (3,638)
Shares issued for stock options   19 395    
Stock-based compensation arrangements     353    
Net income 32,883     32,883  
Dividends on common stock       (9,827)  
Net change (1,034)       (1,034)
Balance at end of period at Sep. 30, 2018 884,801 32,750 149,242 707,481 (4,672)
Balance at beginning of period at Dec. 31, 2018 902,789 32,604 149,709 722,615 (2,139)
Shares issued for stock options   40 873    
Stock-based compensation arrangements     888    
Net income 99,372     99,372  
Dividends on common stock       (29,978)  
Net change 5,768       5,768
Balance at end of period at Sep. 30, 2019 979,752 32,644 151,470 792,009 3,629
Balance at beginning of period at Jun. 30, 2019   32,640 150,995 769,090 3,655
Shares issued for stock options   4 128    
Stock-based compensation arrangements     347    
Net income 33,368     33,368  
Dividends on common stock       (10,449)  
Net change (26)       (26)
Balance at end of period at Sep. 30, 2019 $ 979,752 $ 32,644 $ 151,470 $ 792,009 $ 3,629