SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Comprehensive Income (Details) $ in Thousands	6 Months Ended
	Jun. 25, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	$ (267,218)
Balance at the end of the period	(268,459)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(191,928)
Current-period comprehensive income (loss)	(1,279)
Balance at the end of the period	(193,207)
Unrealized Gain on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	3,678
Current-period comprehensive income (loss)	38
Balance at the end of the period	3,716
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(78,968)
Current-period comprehensive income (loss)	0
Balance at the end of the period	(78,968)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(267,218)
Current-period comprehensive income (loss)	(1,241)
Balance at the end of the period	$ (268,459)