ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes by Component (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (43,774)	$ (43,774)
Other comprehensive income before reclassifications		(976)
Amounts reclassified from accumulated other comprehensive loss		211
Net of tax		(765)
Ending Balance		(50,789)
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		(130)
Amounts reclassified from accumulated other comprehensive loss		0
Net of tax		(130)
Ending Balance		(130)
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		(846)
Amounts reclassified from accumulated other comprehensive loss		0
Net of tax		(846)
Ending Balance		(6,333)
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		0
Amounts reclassified from accumulated other comprehensive loss		211
Net of tax		211
Ending Balance		$ (44,326)
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)