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CONSOLIDATED STATEMENTS 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 SMP [Member]
Non-controlling Interest [Member]
Total
Balance at beginning of period at Dec. 31, 2018 $ 47,872 $ 102,470 $ 380,113 $ (9,594) $ (53,660) $ 467,201 $ 0 $ 467,201
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 0 0 57,917 0 0 57,917 0 57,917
Other comprehensive income (loss), net of tax 0 0 0 1,005 0 1,005 0 1,005
Cash dividends paid 0 0 (20,593) 0 0 (20,593) 0 (20,593)
Purchase of treasury stock 0 0 0 0 (10,738) (10,738) 0 (10,738)
Stock-based compensation 0 (473) 0 0 7,390 6,917 0 6,917
Employee Stock Ownership Plan 0 745 0 0 1,774 2,519 0 2,519
Balance at end of period at Dec. 31, 2019 47,872 102,742 417,437 (8,589) (55,234) 504,228 0 504,228
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 0 0 57,393 0 0 57,393 0 57,393
Other comprehensive income (loss), net of tax 0 0 0 2,913 0 2,913 0 2,913
Cash dividends paid 0 0 (11,218) 0 0 (11,218) 0 (11,218)
Purchase of treasury stock 0 0 0 0 (13,482) (13,482) 0 (13,482)
Stock-based compensation 0 1,712 0 0 6,389 8,101 0 8,101
Employee Stock Ownership Plan 0 630 0 0 1,671 2,301 0 2,301
Balance at end of period at Dec. 31, 2020 47,872 105,084 463,612 (5,676) (60,656) 550,236 0 550,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Noncontrolling interest in business acquired 0 0 0 0 0 0 11,504 11,504
Net earnings 0 0 90,886 0 0 90,886 68 90,954
Other comprehensive income (loss), net of tax 0 0 0 (2,493) 0 (2,493) 15 (2,478)
Cash dividends paid 0 0 (22,179) 0 0 (22,179) 0 (22,179)
Purchase of treasury stock 0 0 0 0 (26,862) (26,862) 0 (26,862)
Dividends paid to noncontrolling interest 0 0 0 0 0 0 (540) (540)
Stock-based compensation 0 159 0 0 9,320 9,479 0 9,479
Employee Stock Ownership Plan 0 134 0 0 2,379 2,513 0 2,513
Balance at end of period at Dec. 31, 2021 $ 47,872 $ 105,377 $ 532,319 $ (8,169) $ (75,819) $ 601,580 $ 11,047 $ 612,627