EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,079	$ 1,668	$ 8,067	$ 2,977
Interest cost	4,455	1,288	9,037	2,325
Expected return on plan assets	(8,692)	(1,988)	(17,447)	(3,603)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	106	26	207	53
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	19	0	19	0
Net periodic benefit cost	(71)	994	(155)	1,752
Defined Benefit Plan, Service Cost	4,079	1,668	8,067	2,977
Defined Benefit Plan, Plan Assets, Contributions by Employer	3,100	800	5,700	1,800
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Service cost	763	121	1,527	121
Interest cost	1,941	265	4,077	265
Expected return on plan assets	(4,327)	(457)	(8,827)	(457)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	19	0	19	0
Net periodic benefit cost	(1,642)	(71)	(3,242)	(71)
Defined Benefit Plan, Service Cost	763	121	1,527	121
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,316	1,547	6,540	2,856
Interest cost	2,514	1,023	4,960	2,060
Expected return on plan assets	(4,365)	(1,531)	(8,620)	(3,146)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	106	26	207	53
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0	0	0	0
Net periodic benefit cost	1,571	1,065	3,087	1,823
Defined Benefit Plan, Service Cost	3,316	1,547	6,540	2,856
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Nonoperating Gains (Losses)	$ (4,200)	$ (700)	(8,200)	$ (1,200)
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 10,400