LEASES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
LEASES
Operating lease right-of-use asset	$ 63,235	$ 68,763
Short-term lease liability	12,371	11,406
Long-term lease liability	51,082	56,164
Total equity	$ 754,336	$ 806,083	$ 823,324	$ 830,223
Package of practical expedients	true
Cumulative Effect, Period of Adoption, Adjustment
LEASES
Total equity				$ 2,636
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment
LEASES
Operating lease right-of-use asset			70,800
Short-term lease liability			8,200
Long-term lease liability			61,200
Total equity			$ 0
Minimum
LEASES
Operating lease, lease term	3 years
Finance lease, lease term	3 years
Maximum
LEASES
Operating lease, lease term	10 years
Finance lease, lease term	10 years