CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 55,688	$ 53,245
Other comprehensive income (loss):
Foreign currency translation adjustment and other	9,885	25,431
Amortization of net loss and prior service benefit included in net periodic cost for pension and other post-retirement benefit plans	374	459
Comprehensive income, before income taxes	65,947	79,135
Less: Income tax (benefit) expense related to items of other comprehensive income	(102)	1,722
Comprehensive income, net of income taxes	66,049	77,413
Less: Comprehensive income related to noncontrolling interests, net of income taxes	1,013	1,178
Comprehensive income attributable to common shareholders, net of income taxes	$ 65,036	$ 76,235