EMPLOYER SPONSORED BENEFIT PLANS - Plan Assets and Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in benefit obligation:
Service cost	$ 134	$ 136	$ 46
Interest cost	1,706	2,886	2,595
Change in plan assets:
Fair value of plan assets at beginning of year	43,938
Fair value of plan assets at end of year	46,562	43,938
United States
Change in benefit obligation:
Net benefit obligation at beginning of year	55,101	102,679
Service cost	134	136
Interest cost	1,706	2,132
Actuarial loss/(gain)	7,257	5,149
Gross benefits paid	(2,835)	(2,932)
Net effect of remeasurement	0	(3,290)
Settlement	(2,920)	(48,773)
Net benefit obligation at end of year	58,443	55,101	102,679
Change in plan assets:
Fair value of plan assets at beginning of year	43,938	87,452
Actual return/(loss) on plan assets	6,430	6,987
Contributions	1,949	1,415
Gross benefits paid	(2,835)	(2,932)
Net effect of remeasurement	0	(211)
Settlement	(2,920)	(48,773)
Fair value of plan assets at end of year	$ 46,562	$ 43,938	$ 87,452