IMPACT OF THE INVASION OF UKRAINE (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Mar. 04, 2022	Dec. 31, 2021
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 209,700,000		$ 209,700,000			$ 236,214,000
Operating lease, right-of-use asset	148,219,000		148,219,000			184,841,000
Commitments related to operating lease agreements that have not yet commenced	17,900,000		17,900,000
Impairment charges			21,212,000	$ 0
Goodwill impairment			686,000
Bad debt expense			12,888,000	$ 2,573,000
Humanitarian Commitment
Unusual or Infrequent Item, or Both [Line Items]
Nonoperating expense	4,500,000		38,500,000
Humanitarian Commitment | Cost of revenues (exclusive of depreciation and amortization)
Unusual or Infrequent Item, or Both [Line Items]
Nonoperating expense	2,900,000		25,300,000
Humanitarian Commitment | Selling, general and administrative expenses
Unusual or Infrequent Item, or Both [Line Items]
Nonoperating expense	1,600,000		13,200,000
Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	71,172,000		71,172,000			78,289,000
Operating lease, right-of-use asset	14,400,000		14,400,000
Ukraine | Cost of revenues (exclusive of depreciation and amortization)
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense	1,000,000		12,900,000
Ukraine | Selling, general and administrative expenses
Unusual or Infrequent Item, or Both [Line Items]
Standby resources expense	4,400,000		37,500,000
Ukraine | Other income/(expense)
Unusual or Infrequent Item, or Both [Line Items]
Impairment charges			1,300,000
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
Russia
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	0		0			$ 16,611,000
Impairment of property, plant and equipment		$ 15,100,000
Operating lease, impairment loss		3,800,000
Goodwill impairment		$ 700,000
Bad debt expense	(2,500,000)		5,700,000
Russia | Employee Severance
Unusual or Infrequent Item, or Both [Line Items]
Exit costs	700,000		16,900,000
Building | Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	71,200,000		71,200,000
Construction in Progress | Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	51,200,000		51,200,000
Computer Equipment | Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	12,700,000		12,700,000
Furniture and Fixtures | Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	5,900,000		5,900,000
Leasehold Improvements | Ukraine
Unusual or Infrequent Item, or Both [Line Items]
Property and equipment, net	$ 1,400,000		$ 1,400,000