EQUIPMENT AND PROPERTY - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 315,891	$ 294,226
Depreciation	40,592	40,623	$ 36,646
Computer equipment and systems
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	223,648	212,010
Internal use software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	143,500	137,900
Accumulated depreciation	105,300	89,400
Foreign Countries [Member]
Property, Plant and Equipment [Line Items]
Fixed Assets held in Foreign Countries	$ 8,400	$ 8,500