Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Income tax expense	$ 142	$ 263	$ 284	$ 480
Foreign Currency Translation Adjustment and Other
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 26, 2015			(82,977)
Other comprehensive loss before reclassifications			(15,145)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Net current period other comprehensive income			(15,145)
Income tax expense			0
June 25, 2016	(98,122)		(98,122)
Pension and Other Post-Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 26, 2015			(52,571)
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			785
Net current period other comprehensive income			785
Income tax expense	100	$ 300	284	$ 500
June 25, 2016	(52,070)		(52,070)
Total
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
December 26, 2015			(135,548)
Other comprehensive loss before reclassifications			(15,145)
Amounts reclassified from accumulated other comprehensive income (loss)			785
Net current period other comprehensive income			(14,360)
Income tax expense			284
June 25, 2016	$ (150,192)		$ (150,192)