ACCRUED LIABILITIES AND ACCRUED LIABILITIES - Narrative (Details) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Payables and Accruals [Abstract]
Increase in employee related activities	$ 19.5
Deferred income tax liabilities, employer taxes	10.6
Increase in accrued vacation costs	$ 6.0

The increase (decrease) during the reporting period in the aggregate amount of obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration