IMPACT OF THE INVASION OF UKRAINE (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Mar. 04, 2022
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 222,244,000		$ 235,053,000
Operating lease, right-of-use asset	135,754,000		134,898,000
Commitments related to operating lease agreements that have not yet commenced	4,700,000
Cost of revenues (exclusive of depreciation and amortization)	834,334,000	$ 855,901,000
Selling, general and administrative expenses	198,453,000	211,887,000
Humanitarian Commitment
Unusual or Infrequent Item, or Both [Line Items]
Commitments related to operating lease agreements that have not yet commenced	34,500,000
Nonoperating expense	3,300,000	6,100,000
Cost of revenues (exclusive of depreciation and amortization)	700,000	2,500,000
Selling, general and administrative expenses	2,600,000	3,600,000
Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	60,825,000		$ 62,653,000
Operating lease, right-of-use asset	5,500,000
Ukraine | Cost of revenues (exclusive of depreciation and amortization)
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense		7,400,000
Ukraine | Selling, general and administrative expenses
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense	700,000	$ 200,000
Ukraine | Humanitarian Commitment
Unusual or Infrequent Item, or Both [Line Items]
Commitments related to operating lease agreements that have not yet commenced				$ 100,000,000
Ukraine | Building
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	60,800,000
Ukraine | Construction in Progress
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	51,700,000
Ukraine | Computer Equipment
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	4,500,000
Ukraine | Furniture and Fixtures
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	3,800,000
Ukraine | Leasehold Improvements
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 800,000