CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 1,171,614	$ 780,775
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	780,836	519,328
Selling, general and administrative expenses	237,277	136,389
Depreciation and amortization expense	24,259	17,807
Income from operations	129,242	107,251
Interest and other (loss)/income, net	(165)	5,374
Foreign exchange (loss)/gain	(22,785)	2,299
Income before provision for income taxes	106,292	114,924
Provision for income taxes	16,573	5,878
Net income	$ 89,719	$ 109,046
Net income per share:
Basic (in usd per share)	$ 1.58	$ 1.94
Diluted (in usd per share)	$ 1.52	$ 1.86
Shares used in calculation of net income per share:
Basic (in shares)	56,915	56,170
Diluted (in shares)	58,941	58,778