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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 19,594 0 0 19,594 0 19,594
Other comprehensive income, net of tax 0 0 0 (4,432) 0 (4,432) 0 (4,432)
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 0 756 0 0 2,550 3,306 0 3,306
Employee Stock Ownership Plan 0 630 0 0 1,671 2,301 0 2,301
Balance at end of period at Jun. 30, 2020 47,872 104,128 431,416 (13,021) (59,739) 510,656 0 510,656
Balance at beginning of period at Mar. 31, 2020 47,872 104,245 420,449 (14,894) (61,059) 496,613 0 496,613
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 0 0 10,967 0 0 10,967 0 10,967
Other comprehensive income, net of tax 0 0 0 1,873 0 1,873 0 1,873
Cash dividends paid 0 0 0 0 0 0 0 0
Purchase of treasury stock 0 0 0 0 0 0 0 0
Stock-based compensation 0 (117) 0 0 1,320 1,203 0 1,203
Employee Stock Ownership Plan 0 0 0 0 0 0 0 0
Balance at end of period at Jun. 30, 2020 47,872 104,128 431,416 (13,021) (59,739) 510,656 0 510,656
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 acquired 0 0 0 0 0 0 11,504 11,504
Net earnings 0 0 48,142 0 0 48,142 19 48,161
Other comprehensive income, net of tax 0 0 0 574 0 574 (22) 552
Cash dividends paid 0 0 (11,134) 0 0 (11,134) 0 (11,134)
Purchase of treasury stock 0 0 0 0 (11,096) (11,096) 0 (11,096)
Stock-based compensation 0 1,844 0 0 2,537 4,381 0 4,381
Employee Stock Ownership Plan 0 134 0 0 2,379 2,513 0 2,513
Balance at end of period at Jun. 30, 2021 47,872 107,062 500,620 (5,102) (66,836) 583,616 11,501 595,117
Balance at beginning of period at Mar. 31, 2021 47,872 106,366 479,024 (7,597) (68,725) 556,940 0 556,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Noncontrolling interest acquired 0 0 0 0 0 0 11,504 11,504
Net earnings 0 0 27,142 0 0 27,142 19 27,161
Other comprehensive income, net of tax 0 0 0 2,495 0 2,495 (22) 2,473
Cash dividends paid 0 0 (5,546) 0 0 (5,546) 0 (5,546)
Purchase of treasury stock 0 0 0 0 0 0 0 0
Stock-based compensation 0 696 0 0 1,889 2,585 0 2,585
Employee Stock Ownership Plan 0 0 0 0 0 0 0 0
Balance at end of period at Jun. 30, 2021 $ 47,872 $ 107,062 $ 500,620 $ (5,102) $ (66,836) $ 583,616 $ 11,501 $ 595,117