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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 53,245	$ 46,959
Other comprehensive income:
Foreign currency translation adjustment and other	25,431	11,221
Amortization of net loss and prior service benefit included in net periodic cost for pension and other post-retirement benefit plans	459	854
Comprehensive income, before income taxes	79,135	59,034
Less: Income tax expense related to items of other comprehensive income	1,722	226
Comprehensive income, net of income taxes	77,413	58,808
Less: Comprehensive income related to noncontrolling interest, net of income taxes	1,178	298
Comprehensive income attributable to common shareholders	$ 76,235	$ 58,510

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