SEGMENT INFORMATION (REVENUE GEOGRAPHY) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,207,587	$ 2,462,817	$ 2,443,707
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization	662,117	752,516	857,643
Other Assets, Noncurrent	101,486	101,573	67,734
United States Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,497,887	1,710,716	1,738,053
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization	427,631	506,092	631,459
Other Assets, Noncurrent	89,849	90,810	56,372
Philippines Asia Pacific India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	419,856	477,455	457,526
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization	150,567	170,403	162,857
Other Assets, Noncurrent	9,298	7,752	8,826
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	174,155	142,665	131,575
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization	39,952	30,290	21,435
Other Assets, Noncurrent	1,559	2,021	1,306
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	115,689	131,981	116,553
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization	43,967	45,731	41,892
Other Assets, Noncurrent	$ 780	$ 990	$ 1,230