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SEGMENT INFORMATION - Narrative (Details) - segment	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Number of reportable segments	3
Sales Revenue, Net | Geographic Concentration Risk | United States
Segment Reporting Information [Line Items]
Percentage of total consolidated revenues from external customers	78.00%	72.00%	67.00%
Sales Revenue, Net | Geographic Concentration Risk | United Kingdom
Segment Reporting Information [Line Items]
Percentage of total consolidated revenues from external customers	8.00%	8.00%	9.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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+ References

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