CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues	$ 1,170,206	$ 1,194,861	$ 2,381,147	$ 2,366,475
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	808,715	846,323	1,664,616	1,627,159
Selling, general and administrative expenses	194,377	232,527	406,264	469,804
Depreciation and amortization expense	22,768	22,991	45,550	47,250
Income from operations	144,346	93,020	264,717	222,262
Interest and other income, net	11,710	1,579	23,231	1,414
Foreign exchange loss	(6,010)	(85,941)	(10,618)	(108,726)
Income before provision for income taxes	150,046	8,658	277,330	114,950
Provision for/(benefit from) income taxes	30,013	(9,946)	55,005	6,627
Net income	$ 120,033	$ 18,604	$ 222,325	$ 108,323
Net income per share:
Basic (in usd per share)	$ 2.07	$ 0.33	$ 3.84	$ 1.90
Diluted (in usd per share)	$ 2.03	$ 0.32	$ 3.75	$ 1.84
Shares used in calculation of net income per share:
Basic (in shares)	57,993	57,240	57,848	57,078
Diluted (in shares)	59,181	59,020	59,240	58,981