PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) plan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Number of plans covering nonunion employees | plan		1
Gain (loss) due to settlements and curtailments		$ 7,100
Pension settlement charges	$ 2,200
Pension expense		5,500	$ 9,800	$ 5,600
Foreign Defined Contribution Plans
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Pension expense		$ 1,000	1,000	1,000
Equity investment funds
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Target plan asset allocations (percent)	46.00%	46.00%
Fixed income funds
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Target plan asset allocations (percent)	54.00%	54.00%
Union Pension Plan
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Discretionary contributions in current fiscal year			9,000
Nonunion Pension Plan
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Discretionary contributions in current fiscal year			43,000
Pension Benefits
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Number of plans | plan		2
Net actuarial loss		$ (12,794)	(10,326)
Actuarial (loss) gain	$ (1,465)	(1,465)
Net periodic benefit cost		$ (5,423)	(2,758)	11,663
Other Benefits
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Number of plans | plan		2
Net actuarial loss		$ 227	(581)
Actuarial (loss) gain	71	71
Net periodic benefit cost		(1,309)	$ (1,172)	$ (702)
Estimated future employer contributions	$ 200	$ 200