IMPACT OF THE INVASION OF UKRAINE (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Mar. 04, 2022
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 207,502,000		$ 207,502,000		$ 235,053,000
Operating lease, right-of-use asset	129,929,000		129,929,000		134,898,000
Cost of revenues (exclusive of depreciation and amortization)	763,992,000	$ 794,265,000	2,409,183,000	$ 2,458,881,000
Selling, general and administrative expenses	206,820,000	194,829,000	599,331,000	601,093,000
Humanitarian Commitment
Unusual or Infrequent Item, or Both [Line Items]
Commitments related to operating lease agreements that have not yet commenced	28,300,000		28,300,000
Nonoperating expense	3,600,000	3,600,000	9,500,000	13,600,000
Cost of revenues (exclusive of depreciation and amortization)	600,000	3,000,000.0	1,800,000	8,300,000
Selling, general and administrative expenses	3,000,000.0	600,000	7,700,000	5,300,000
Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	58,793,000		58,793,000		$ 62,653,000
Operating lease, right-of-use asset	4,200,000		4,200,000
Ukraine | Cost of revenues (exclusive of depreciation and amortization)
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense		0.0		9,400,000
Ukraine | Selling, general and administrative expenses
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense	0.0	$ 400,000	900,000	$ 900,000
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	58,800,000		58,800,000
Ukraine | Construction in Progress
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	52,200,000		52,200,000
Ukraine | Computer Equipment
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	3,000,000.0		3,000,000.0
Ukraine | Furniture and Fixtures
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	3,100,000		3,100,000
Ukraine | Leasehold Improvements
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 500,000		$ 500,000