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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
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 31,648 0 0 31,648
Other comprehensive income, net of tax 0 0 0 1,083 0 1,083
Cash dividends paid 0 0 (10,296) 0 0 (10,296)
Purchase of treasury stock 0 0 0 0 (10,738) (10,738)
Stock-based compensation 0 2,132 0 0 1,716 3,848
Employee Stock Ownership Plan 0 745 0 0   2,519
Employee Stock Ownership Plan         1,774  
Balance at end of period at Jun. 30, 2019 47,872 105,347 401,465 (8,511) (60,908) 485,265
Balance at beginning of period at Mar. 31, 2019 47,872 104,467 387,170 (8,904) (57,565) 473,040
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 19,432 0 0 19,432
Other comprehensive income, net of tax 0 0 0 393 0 393
Cash dividends paid 0 0 (5,137) 0 0 (5,137)
Purchase of treasury stock 0 0 0 0 (4,411) (4,411)
Stock-based compensation 0 880 0 0 1,068 1,948
Balance at end of period at Jun. 30, 2019 47,872 105,347 401,465 (8,511) (60,908) 485,265
Balance at beginning of period at Dec. 31, 2019 47,872 102,742 417,437 (8,589) (55,234) 504,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 19,594 0 0 19,594
Other comprehensive income, net of tax 0 0 0 (4,432) 0 (4,432)
Cash dividends paid 0 0 (5,615) 0 0 (5,615)
Purchase of treasury stock 0 0 0 0 (8,726) (8,726)
Stock-based compensation 0 756 0 0 2,550 3,306
Employee Stock Ownership Plan 0 630 0 0   2,301
Employee Stock Ownership Plan         1,671  
Balance at end of period at Jun. 30, 2020 47,872 104,128 431,416 (13,021) (59,739) 510,656
Balance at beginning of period at Mar. 31, 2020 47,872 104,245 420,449 (14,894) (61,059) 496,613
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 10,967 0 0 10,967
Other comprehensive income, net of tax 0 0 0 1,873 0 1,873
Cash dividends paid 0 0 0 0 0 0
Purchase of treasury stock 0 0 0 0 0 0
Stock-based compensation 0 (117) 0 0 1,320 1,203
Balance at end of period at Jun. 30, 2020 $ 47,872 $ 104,128 $ 431,416 $ (13,021) $ (59,739) $ 510,656