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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Common Stock [Member]
Adjustments Due to Adoption of ASU 2014-09 [Member]
Capital in Excess of Par Value [Member]
Capital in Excess of Par Value [Member]
Adjustments Due to Adoption of ASU 2014-09 [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Adjustments Due to Adoption of ASU 2014-09 [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Adjustments Due to Adoption of ASU 2014-09 [Member]
Treasury Stock [Member]
Treasury Stock [Member]
Adjustments Due to Adoption of ASU 2014-09 [Member]
Total
Adjustments Due to Adoption of ASU 2014-09 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Cumulative effect adjustment | ASC 606 [Member]   $ 0   $ 0   $ (1,189)   $ 0   $ 0   $ (1,189)
Balance at beginning of period at Dec. 31, 2017 $ 47,872   $ 100,057   $ 357,153   $ (4,109)   $ (47,319)   $ 453,654  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0   0   39,683   0   0   39,683  
Other comprehensive income (loss), net of tax 0   0   0   (3,008)   0   (3,008)  
Cash dividends paid 0   0   (14,144)   0   0   (14,144)  
Purchase of treasury stock 0   0   0   0   (9,115)   (9,115)  
Stock-based compensation 0   4,054   0   0       5,614  
Stock-based compensation                 1,560      
Employee stock ownership plan 0   765   0   0       2,557  
Employee stock ownership plan                 1,792      
Balance at end of period at Sep. 30, 2018 47,872   104,876   381,503   (7,117)   (53,082)   474,052  
Balance at beginning of period at Jun. 30, 2018 47,872   103,403   370,461   (7,830)   (51,536)   462,370  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0   0   15,749   0   0   15,749  
Other comprehensive income (loss), net of tax 0   0   0   713   0   713  
Cash dividends paid 0   0   (4,707)   0   0   (4,707)  
Purchase of treasury stock 0   0   0   0   (1,791)   (1,791)  
Stock-based compensation 0   1,473   0   0       1,718  
Stock-based compensation                 245      
Balance at end of period at Sep. 30, 2018 47,872   104,876   381,503   (7,117)   (53,082)   474,052  
Balance at beginning of period at Dec. 31, 2018 47,872   102,470   380,113   (9,594)   (53,660)   467,201  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0   0   46,399   0   0   46,399  
Other comprehensive income (loss), net of tax 0   0   0   (1,642)   0   (1,642)  
Cash dividends paid 0   0   (15,429)   0   0   (15,429)  
Purchase of treasury stock 0   0   0   0   (10,738)   (10,738)  
Stock-based compensation 0   2,828   0   0       5,742  
Stock-based compensation                 2,914      
Employee stock ownership plan 0   745   0   0       2,519  
Employee stock ownership plan                 1,774      
Balance at end of period at Sep. 30, 2019 47,872   106,043   411,083   (11,236)   (59,710)   494,052  
Balance at beginning of period at Jun. 30, 2019 47,872   105,347   401,465   (8,511)   (60,908)   485,265  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0   0   14,751   0   0   14,751  
Other comprehensive income (loss), net of tax 0   0   0   (2,725)   0   (2,725)  
Cash dividends paid 0   0   (5,133)   0   0   (5,133)  
Stock-based compensation 0   696   0   0       1,894  
Stock-based compensation                 1,198      
Balance at end of period at Sep. 30, 2019 $ 47,872   $ 106,043   $ 411,083   $ (11,236)   $ (59,710)   $ 494,052