Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 25, 2016	Dec. 31, 2015	Dec. 31, 2014
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease)	$ 105,200,000
Net Income	41,381,000	$ 41,381,000	$ 23,944,000	$ 8,803,000
Foreign currency translation gain (loss)	(16,904,000)	(16,904,000)	(16,810,000)	(13,369,000)
Change in fair value of derivatives		(11,062,000)	(7,189,000)	(7,598,000)
Tax benefit		4,250,000	2,665,000	2,833,000
Change in unrecognized gains (losses) on derivative instruments, net of tax	$ (6,812,000)	(6,812,000)	(4,524,000)	(4,765,000)
Actuarial gains (losses) on pension obligations, net of curtailments and amortization		799,000	1,807,000	(4,686,000)
Tax (provision) benefit		(295,000)	(761,000)	1,758,000
Pension changes, net of tax		504,000	1,046,000	(2,928,000)
Other comprehensive income (loss), net of tax		(23,212,000)	(20,288,000)	(21,062,000)
Comprehensive income (loss)		$ 18,169,000	$ 3,656,000	$ (12,259,000)