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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 54,379	$ 54,602	$ 107,624	$ 101,561
Other comprehensive income:
Foreign currency translation adjustment and other	(33,150)	33,451	(7,719)	44,672
Amortization of net loss and prior service benefit included in net periodic cost for pension and other post-retirement benefit plans	790	901	1,249	1,755
Comprehensive income, before income taxes	22,019	88,954	101,154	147,988
Less: Income tax (benefit) expense related to items of other comprehensive income	(2,320)	397	(598)	623
Comprehensive income, net of income taxes	24,339	88,557	101,752	147,365
Less: Comprehensive (loss) income related to noncontrolling interest, net of income taxes	(218)	900	960	1,198
Comprehensive income attributable to common shareholders	$ 24,557	$ 87,657	$ 100,792	$ 146,167

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