SEGMENT REPORTING - Revenue, significant expenses and net income (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2025		Jun. 30, 2024	Jun. 30, 2025		Jun. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue		$ 1,275,441		$ 1,060,681	$ 2,517,807		$ 2,069,784
Stock based compensation		118,325		87,569	225,938		175,698
Depreciation and amortization					106,592		87,202
Loss related to contingent liability		128,545		0	128,545		0
Restructuring		47		(33)	(62)		247
Interest income		(25,978)		(8,885)	(52,200)		(18,397)
Interest expense		28,948		12,905	58,066		21,597
Provision for income taxes		120,556		86,190	202,669		148,590
Net income		160,051		229,520	433,630		477,163
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue		1,275,441		1,060,681	2,517,807		2,069,784
Salary, benefits and other employee-related costs		521,608		463,363	1,064,265		939,250
Stock based compensation		118,325		87,569	225,938		175,698
Manufacturing costs		101,480		61,048	183,149		120,709
Facilities and other infrastructure costs		47,277		42,465	91,115		84,119
Depreciation and amortization		53,676		50,646	106,592		87,202
Professional services		37,684		38,761	70,143		77,675
Loss related to contingent liability		128,545	[1]	0	128,545	[1]	0
Restructuring		47		(33)	(62)		247
Other segment items	[2]	(16,778)		(2,868)	5,957		(44,069)
Interest income		(25,978)		(8,885)	(52,200)		(18,397)
Interest expense		28,948		12,905	58,066		21,597
Provision for income taxes		120,556		86,190	202,669		148,590
Net income		$ 160,051		$ 229,520	$ 433,630		$ 477,163

[1] For information regarding the loss related to a contingent liability, see Note 14 in the notes to condensed consolidated financial statements.

[2] Other segment items include direct costs for advertising, marketing events, travel, entertainment, bad debt and other operating expense categories that are not considered significant individually. It also includes non-operating expenses such as gains and losses on investments, foreign currency and other non-operating expenses that are not considered significant individually.