EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Pension_Plan	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Amounts recognized in balance sheet:
Noncurrent liabilities	$ (38,020)	$ (42,178)
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	$ 9,100	10,300
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligation, beginning of year	10,300	10,500
Service cost	0	0	$ 100
Interest cost	300	300	300
Actuarial (gain)/loss	(500)	600
Settlements paid	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1,000	1,100
Foreign currency exchange	0	0
Benefit obligation, end of year	$ 9,100	10,300	10,500
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	1,000	1,100
Settlements paid	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	1,000	1,100
Foreign currency exchange	0	0
Plan assets, end of year	0	0	0
Funded status	(9,100)	(10,300)
Amounts recognized in balance sheet:
Current liabilities	(1,000)	(1,100)
Noncurrent liabilities	(8,100)	(9,200)
Net liability, end of year	(9,100)	(10,300)
Amount recognized in accumulated other comprehensive income/(loss):
Prior service cost	0	100
Net actuarial loss	600	1,100
Settlement	0	0
Total recognized in accumulated other comprehensive income/(loss)	600	1,200
Pension Benefits
Net Periodic Benefit Cost and Other Benefit Cost
Accumulated benefit obligation, end of year	164,900	180,500
Defined Benefit Plan, Change in Benefit Obligation
Benefit obligation, beginning of year	185,100	181,100
Service cost	600	700	900
Interest cost	5,400	5,600	6,000
Actuarial (gain)/loss	(9,500)	7,000
Settlements paid	(300)	(200)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	11,400	11,900
Foreign currency exchange	(1,000)	2,800
Benefit obligation, end of year	168,900	185,100	181,100
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of assets, beginning of year	153,300	146,100
Actual return on plan assets	(3,800)	16,100
Company contributions	2,500	2,500
Settlements paid	(300)	(100)
Defined Benefit Plan, Plan Assets, Benefits Paid	11,400	11,900
Foreign currency exchange	(200)	600
Plan assets, end of year	140,100	153,300	$ 146,100
Funded status	(28,800)	(31,800)
Amounts recognized in balance sheet:
Current liabilities	(400)	(400)
Noncurrent liabilities	(28,400)	(31,400)
Net liability, end of year	(28,800)	(31,800)
Amount recognized in accumulated other comprehensive income/(loss):
Prior service cost	0	0
Net actuarial loss	47,500	47,600
Settlement	400	500
Total recognized in accumulated other comprehensive income/(loss)	$ 47,900	$ 48,100