Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 147,625	$ 144,275
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	39,068	38,010
Stock-based compensation expense	57,179	42,985
Reduction in the carrying amount of operating lease right-of-use assets	16,070	15,171
Fair value mark-to-market of investments	(1,233)	6,003
Unrealized foreign currency exchange (gain)/loss, net	(3,064)	(862)
Deferred income tax benefit	(25,423)	(26,555)
Others, net	(341)	6,328
Change in operating assets and liabilities:
Accounts receivable	(28,900)	(46,488)
Other current and non-current assets	(6,961)	(19,204)
Income taxes payable, net	(8,438)	(12,022)
Deferred revenue	35	2,319
Accrued employee costs	(6,435)	(1,853)
Accounts payable, accrued expenses and other liabilities	10,177	(325)
Operating lease liabilities	(15,180)	(15,622)
Payment of contingent consideration	(11,000)	0
Net cash provided by operating activities	163,179	132,160
Cash flows from investing activities:
Purchases of property and equipment	(36,188)	(41,106)
Proceeds from sale of property and equipment	172	640
Investment in equity affiliate	(600)	(600)
Business acquisition (net of cash acquired)	(24,466)	0
Purchases of investments	(225,555)	(165,021)
Proceeds from redemption of investments	192,162	217,525
Net cash (used for)/provided by investing activities	(94,475)	11,438
Cash flows from financing activities:
Principal payments of finance lease liabilities	(222)	(120)
Proceeds from borrowings	290,000	70,000
Repayments of borrowings	(145,000)	(110,000)
Acquisition of treasury stock	(195,880)	(100,542)
Payment of contingent consideration	(4,000)	(5,000)
Proceeds from issuance of common stock	3,524	4,690
Payment of debt issuance costs	(593)	0
Net cash used for financing activities	(52,171)	(140,972)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,330	(288)
Net increase in cash, cash equivalents and restricted cash	17,863	2,338
Cash, cash equivalents and restricted cash at the beginning of the period	145,401	125,621
Cash, cash equivalents and restricted cash at the end of the period	163,264	127,959
Cash paid during the period for:
Interest	14,346	10,580
Income taxes	78,069	76,743
Supplemental disclosure of non-cash investing and financing activities:
Additions to property and equipment not yet paid	2,756	3,975
Assets acquired under finance lease	$ 972	$ 285