CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 35,557	$ 49,245	$ 73,106	$ 80,859
Other comprehensive income (loss):
Foreign currency translation adjustment and other	(8,114)	17,953	(15,910)	(14,716)
Cumulative translation adjustment related to intercompany loan forgiveness	0	0	0	(2,341)
Amortization of net loss and prior service benefit included in net periodic cost for pension and other post-retirement benefit plans	395	761	785	1,490
Other comprehensive income, before income taxes	27,838	67,959	57,981	65,292
Income tax expense related to items of other comprehensive income	142	263	284	480
Comprehensive income, net of income taxes	27,696	67,696	57,697	64,812
Less: Comprehensive income (loss) related to noncontrolling interests	(136)	805	(9)	878
Comprehensive income attributable to common shareholders	$ 27,832	$ 66,891	$ 57,706	$ 63,934