IMPACT OF THE INVASION OF UKRAINE (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Mar. 04, 2022
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 210,378,000		$ 210,378,000		$ 235,053,000
Operating lease, right-of-use asset	129,953,000		129,953,000		134,898,000
Cost of revenues (exclusive of depreciation and amortization)	810,857,000	$ 808,715,000	1,645,191,000	$ 1,664,616,000
Selling, general and administrative expenses	194,058,000	194,377,000	392,511,000	406,264,000
Humanitarian Commitment
Unusual or Infrequent Item, or Both [Line Items]
Commitments related to operating lease agreements that have not yet commenced	31,800,000		31,800,000
Nonoperating expense	2,700,000	3,900,000	6,000,000.0	10,000,000.0
Cost of revenues (exclusive of depreciation and amortization)	600,000	2,900,000	1,200,000	5,300,000
Selling, general and administrative expenses	2,100,000	1,000,000.0	4,800,000	4,700,000
Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	59,792,000		59,792,000		$ 62,653,000
Operating lease, right-of-use asset	4,600,000		4,600,000
Ukraine | Cost of revenues (exclusive of depreciation and amortization)
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense		2,000,000.0		9,400,000
Ukraine | Selling, general and administrative expenses
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense	100,000	$ 200,000	800,000	$ 400,000
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	59,800,000		59,800,000
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	3,600,000		3,600,000
Ukraine | Furniture and Fixtures
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	3,400,000		3,400,000
Ukraine | Leasehold Improvements
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 600,000		$ 600,000