EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Pension_Plan	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($)
Amounts recognized in balance sheet:
Noncurrent liabilities	$ (42,178)	$ (45,307)
Domestic Plan Plans
Defined Benefit Plan, Change in Benefit Obligation
Number of pension plans | Pension_Plan	2
Foreign Plan
Defined Benefit Plan, Change in Benefit Obligation
Number of pension plans | Pension_Plan	3
Other Benefits
Net Periodic Benefit Cost and Other Benefit Cost
Accumulated benefit obligation, end of year	$ 10,300	10,500
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligation, beginning of year	10,500	11,300
Service cost	0	100	$ 100
Interest cost	300	300	500
Actuarial (gain)/loss	600	0
Settlements paid	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1,100	1,200
Curtailment	0	0
Foreign currency exchange	0	0
Benefit obligation, end of year	$ 10,300	10,500	11,300
Actuarially reduced benefits for employees who retire before defined age	65 years
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of assets, beginning of year	$ 0	0
Actual return on plan assets	0	0
Company contributions	1,100	1,200
Settlements paid	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	1,100	1,200
Foreign currency exchange	0	0
Plan assets, end of year	0	0	0
Funded status	(10,300)	(10,500)
Amounts recognized in balance sheet:
Current liabilities	(1,100)	(1,100)
Noncurrent liabilities	(9,200)	(9,400)
Net liability, end of year	(10,300)	(10,500)
Amount recognized in accumulated other comprehensive income/(loss):
Prior service cost	100	200
Net actuarial loss	1,100	900
Settlement	0	0
Total recognized in accumulated other comprehensive income/(loss)	1,200	1,100
Pension Benefits
Net Periodic Benefit Cost and Other Benefit Cost
Accumulated benefit obligation, end of year	180,500	177,000
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligation, beginning of year	181,100	186,900
Service cost	700	900	1,400
Interest cost	5,600	6,000	7,500
Actuarial (gain)/loss	7,000	4,100
Settlements paid	(200)	(600)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	11,900	15,700
Curtailment	0	0
Foreign currency exchange	2,800	(500)
Benefit obligation, end of year	185,100	181,100	186,900
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of assets, beginning of year	146,100	147,400
Actual return on plan assets	16,100	9,500
Company contributions	2,500	5,500
Settlements paid	(100)	(500)
Defined Benefit Plan, Plan Assets, Benefits Paid	11,900	15,700
Foreign currency exchange	600	(100)
Plan assets, end of year	153,300	146,100	$ 147,400
Funded status	(31,800)	(35,000)
Amounts recognized in balance sheet:
Current liabilities	(400)	(300)
Noncurrent liabilities	(31,400)	(34,700)
Net liability, end of year	(31,800)	(35,000)
Amount recognized in accumulated other comprehensive income/(loss):
Prior service cost	0	0
Net actuarial loss	47,600	48,900
Settlement	500	1,500
Total recognized in accumulated other comprehensive income/(loss)	$ 48,100	$ 50,400