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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Earnings Attributable to SMP        
Earnings from continuing operations $ 27,995 $ 11,842 $ 50,159 $ 21,463
Loss from discontinued operations (853) (875) (2,017) (1,869)
Net earnings attributable to SMP $ 27,142 $ 10,967 $ 48,142 $ 19,594
Basic Net Earnings Per Common Share Attributable to SMP        
Earnings from continuing operations per common share (in dollars per share) $ 1.26 $ 0.53 $ 2.25 $ 0.96
Loss from discontinued operations per common share (in dollars per share) (0.04) (0.04) (0.09) (0.08)
Net earnings per common share attributable to SMP $ 1.22 $ 0.49 $ 2.16 $ 0.88
Weighted average common shares outstanding (in shares) 22,198,545 22,330,476 22,257,922 22,384,281
Diluted Net Earnings Per Common Share Attributable to SMP        
Earnings from continuing operations per common share (in dollars per share) $ 1.23 $ 0.52 $ 2.21 $ 0.94
Loss from discontinued operations per common share (in dollars per share) (0.03) (0.04) (0.09) (0.08)
Net earnings per common share attributable to SMP $ 1.20 $ 0.48 $ 2.12 $ 0.86
Weighted average common shares outstanding (in shares) 22,198,545 22,330,476 22,257,922 22,384,281
Plus incremental shares from assumed conversions [Abstract]        
Dilutive effect of restricted stock and performance-based stock (in shares) 487,000 389,000 483,000 410,000
Weighted average common shares outstanding - Diluted (in shares) 22,686,384 22,718,680 22,741,171 22,793,606
Restricted and Performance-Based Shares [Member]        
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 239,000 261,000 258,000 257,000