CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 37,867	$ 32,352	$ 118,726	$ 100,526
Foreign currency translation adjustment and other	(31,843)	(31,635)	(46,559)	(23,751)
Cumulative translation adjustment related to intercompany loan forgiveness	0	0	(2,341)	0
Pension and other post-retirement benefit plans:
Amortization of net loss and prior service benefit included in net periodic pension cost	695	291	2,185	871
Comprehensive income, before income taxes	6,719	1,008	72,011	77,646
Income tax expense related to items of other comprehensive income	220	125	700	273
Comprehensive income, net of income taxes	6,499	883	71,311	77,373
Less: Comprehensive income (loss) related to noncontrolling interests	(443)	712	435	852
Comprehensive income attributable to common shareholders	$ 6,942	$ 171	$ 70,876	$ 76,521