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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 46,959	$ 37,549
Other comprehensive income (loss):
Foreign currency translation adjustment and other	11,221	(7,796)
Amortization of net loss and prior service benefit included in net periodic cost for pension and other post-retirement benefit plans	854	390
Comprehensive income, before income taxes	59,034	30,143
Income tax expense related to items of other comprehensive income (Note 8)	226	142
Comprehensive income, net of income taxes	58,808	30,001
Less: Comprehensive income related to noncontrolling interests, net of income taxes	298	127
Comprehensive income attributable to common shareholders, net of income taxes	$ 58,510	$ 29,874

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