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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, 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 0 0 55,351 0 0 55,351 84 55,435
Other comprehensive income (loss), net of tax 0 0 0 (4,301) 0 (4,301) (113) (4,414)
Cash dividends paid 0 0 (23,428) 0 0 (23,428) 0 (23,428)
Purchase of treasury stock 0 0 0 0 (29,656) (29,656) 0 (29,656)
Stock-based compensation 0 (131) 0 0 8,309 8,178 0 8,178
Employee Stock Ownership Plan 0 369 0 0 1,927 2,296 0 2,296
Balance at end of period at Dec. 31, 2022 $ 47,872 $ 105,615 $ 564,242 $ (12,470) $ (95,239) $ 610,020 $ 11,018 $ 621,038