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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 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 48,219 0 0 48,219 0 48,219
Other comprehensive income, net of tax 0 0 0 (1,570) 0 (1,570) 0 (1,570)
Cash dividends paid 0 0 (5,615) 0 0 (5,615) 0 (5,615)
Purchase of treasury stock 0 0 0 0 (8,726) (8,726) 0 (8,726)
Stock-based compensation 0 3,204 0 0 2,863 6,067 0 6,067
Employee Stock Ownership Plan 0 630 0 0 1,671 2,301 0 2,301
Balance at end of period at Sep. 30, 2020 47,872 106,576 460,041 (10,159) (59,426) 544,904 0 544,904
Balance at beginning of period at Jun. 30, 2020 47,872 104,128 431,416 (13,021) (59,739) 510,656 0 510,656
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 0 0 28,625 0 0 28,625 0 28,625
Other comprehensive income, net of tax 0 0 0 2,862 0 2,862 0 2,862
Stock-based compensation 0 2,448 0 0 313 2,761 0 2,761
Balance at end of period at Sep. 30, 2020 47,872 106,576 460,041 (10,159) (59,426) 544,904 0 544,904
Balance at beginning 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 72,192 0 0 72,192 32 72,224
Other comprehensive income, net of tax 0 0 0 (1,916) 0 (1,916) (2) (1,918)
Cash dividends paid 0 0 (16,678) 0 0 (16,678) 0 (16,678)
Purchase of treasury stock 0 0 0 0 (26,518) (26,518) 0 (26,518)
Stock-based compensation 0 4,357 0 0 2,832 7,189 0 7,189
Employee Stock Ownership Plan 0 134 0 0 2,379 2,513 0 2,513
Balance at end of period at Sep. 30, 2021 47,872 109,575 519,126 (7,592) (81,963) 587,018 11,534 598,552
Balance at beginning of period at Jun. 30, 2021 47,872 107,062 500,620 (5,102) (66,836) 583,616 11,501 595,117
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 0 0 24,050 0 0 24,050 13 24,063
Other comprehensive income, net of tax 0 0 0 (2,490) 0 (2,490) 20 (2,470)
Cash dividends paid 0 0 (5,544) 0 0 (5,544) 0 (5,544)
Purchase of treasury stock 0 0 0 0 (15,422) (15,422) 0 (15,422)
Stock-based compensation 0 2,513 0 0 295 2,808 0 2,808
Balance at end of period at Sep. 30, 2021 $ 47,872 $ 109,575 $ 519,126 $ (7,592) $ (81,963) $ 587,018 $ 11,534 $ 598,552