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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Total SMP
Non- Controlling Interest
Beginning balance at Dec. 31, 2023 $ 650,873 $ 47,872 $ 101,751 $ 573,226 $ (5,974) $ (81,811) $ 635,064 $ 15,809
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 30,482     29,697     29,697 785
Other comprehensive income (loss), net of tax (3,583)       (3,600)   (3,600) 17
Cash dividends paid (19,004)     (19,004)     (19,004)  
Purchase of treasury stock (10,409)         (10,409) (10,409)  
Dividends to noncontrolling interest (2,000)             (2,000)
Stock-based compensation 4,298   2,064     2,234 4,298  
Employee Stock Ownership Plan 2,787   3     2,784 2,787  
Ending balance at Sep. 30, 2024 653,444 47,872 103,818 583,919 (9,574) (87,202) 638,833 14,611
Beginning balance at Jun. 30, 2024 654,322 47,872 102,738 586,407 (9,462) (87,537) 640,018 14,304
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 4,085     3,810     3,810 275
Other comprehensive income (loss), net of tax (80)       (112)   (112) 32
Cash dividends paid (6,298)     (6,298)     (6,298)  
Stock-based compensation 1,415   1,080     335 1,415  
Ending balance at Sep. 30, 2024 653,444 47,872 103,818 583,919 (9,574) (87,202) 638,833 14,611
Beginning balance at Dec. 31, 2024 630,082 47,872 100,135 575,385 (25,832) (81,815) 615,745 14,337
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 34,105     33,473     33,473 632
Other comprehensive income (loss), net of tax 40,473       40,387   40,387 86
Cash dividends paid (20,408)     (20,408)     (20,408)  
Dividends to noncontrolling interest (335)             (335)
Stock-based compensation 5,515   3,440     2,075 5,515  
Employee Stock Ownership Plan 2,700   (737)     3,437 2,700  
Ending balance at Sep. 30, 2025 692,132 47,872 102,838 588,450 14,555 (76,303) 677,412 14,720
Beginning balance at Jun. 30, 2025 703,459 47,872 101,036 599,601 16,825 (76,715) 688,619 14,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings (4,173)     (4,335)     (4,335) 162
Other comprehensive income (loss), net of tax (2,217)       (2,270)   (2,270) 53
Cash dividends paid (6,816)     (6,816)     (6,816)  
Dividends to noncontrolling interest (335)             (335)
Stock-based compensation 2,214   1,802     412 2,214  
Ending balance at Sep. 30, 2025 $ 692,132 $ 47,872 $ 102,838 $ 588,450 $ 14,555 $ (76,303) $ 677,412 $ 14,720