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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 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, 2019 $ 47,872 $ 102,742 $ 417,437 $ (8,589) $ (55,234) $ 504,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 8,627 0 0 8,627
Other comprehensive income, net of tax 0 0 0 (6,305) 0 (6,305)
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 0 873 0 0 1,230 2,103
Employee Stock Ownership Plan 0 630 0 0 1,671 2,301
Balance at end of period at Mar. 31, 2020 47,872 104,245 420,449 (14,894) (61,059) 496,613
Balance at beginning of period at Dec. 31, 2020 47,872 105,084 463,612 (5,676) (60,656) 550,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 0 0 21,000 0 0 21,000
Other comprehensive income, net of tax 0 0 0 (1,921) 0 (1,921)
Cash dividends paid 0 0 (5,588) 0 0 (5,588)
Purchase of treasury stock 0 0 0 0 (11,096) (11,096)
Stock-based compensation 0 1,148 0 0 648 1,796
Employee Stock Ownership Plan 0 134 0 0 2,379 2,513
Balance at end of period at Mar. 31, 2021 $ 47,872 $ 106,366 $ 479,024 $ (7,597) $ (68,725) $ 556,940