ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes by Component (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (43,774)	$ (43,774)
Other comprehensive income before reclassifications		(6,590)
Amounts reclassified from accumulated other comprehensive loss		3,631
Net of tax		(2,959)
Ending Balance		(52,983)
Unrealized gains (losses) on Interest Rate Swaps
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	0	0
Other comprehensive income before reclassifications		1,053
Amounts reclassified from accumulated other comprehensive loss		0
Net of tax		1,053
Ending Balance		1,053
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(5,487)	(5,487)
Other comprehensive income before reclassifications		(11,892)
Amounts reclassified from accumulated other comprehensive loss		0
Net of tax		(11,892)
Ending Balance		(17,379)
Pension and Other Post-Employment Liability Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(38,287)	(38,287)
Other comprehensive income before reclassifications		4,249
Amounts reclassified from accumulated other comprehensive loss		3,631
Net of tax		7,880
Ending Balance		$ (36,657)
ASU 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Adoption of ASU 2018-02	(6,250)
ASU 2018-02 | Pension and Other Post-Employment Liability Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Adoption of ASU 2018-02	$ (6,250)