CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings	$ 11,957	$ 19,438
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,820	(638)
Derivative instruments	(1,377)	0
Pension and postretirement plans	(3)	(5)
Total other comprehensive income (loss), net of tax	1,440	(643)
Total Comprehensive income	13,397	18,795
Comprehensive income (loss) attributable to noncontrolling interest, net of tax:
Net earnings (loss)	39	(8)
Foreign currency translation adjustments	(29)	3
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	10	(5)
Comprehensive income attributable to SMP	$ 13,387	$ 18,800