SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	$ (134,433)
Balance at the end of the period	(223,007)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(99,618)
Current-period comprehensive income (loss)	(89,345)
Balance at the end of the period	(188,963)
Unrealized Gain on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	3,879
Current-period comprehensive income (loss)	771
Balance at the end of the period	4,650
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(38,694)
Current-period comprehensive income (loss)	0
Balance at the end of the period	(38,694)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(134,433)
Current-period comprehensive income (loss)	(88,574)
Balance at the end of the period	$ (223,007)