CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 198,297	$ 184,558	$ 142,968
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	55,221	50,280	56,102
Stock-based compensation expense	72,658	58,437	49,366
Reduction in the carrying amount of operating lease right-of-use assets	21,764	20,188	21,783
Fair value mark-to-market on investments	(1,514)	17,044	(1,209)
Unrealized foreign currency exchange gain, net	(5,136)	(1,363)	(16,643)
Deferred income tax benefit	(19,885)	(31,742)	(19,552)
Others, net	(680)	5,301	9,443
Change in operating assets and liabilities:
Accounts receivable	4,647	(49,242)	(68,121)
Other current and non-current assets	(48,373)	(24,339)	(18,432)
Income taxes payable, net	(26,204)	(18,282)	8,779
Accounts payable, accrued expenses and other liabilities	20,509	7,326	16,860
Deferred revenue	7,002	(877)	2,473
Accrued employee costs	21,708	14,090	5,551
Payment of contingent consideration	(11,000)	0	0
Operating lease liabilities	(20,489)	(20,181)	(23,227)
Net cash provided by operating activities	268,525	211,198	166,141
Cash flows from investing activities:
Purchases of property and equipment	(46,262)	(52,803)	(44,836)
Proceeds from sale of property and equipment	215	739	266
Business acquisition (net of cash acquired)	(24,299)	0	(3,872)
Purchases of investments	(289,012)	(235,369)	(212,607)
Proceeds from redemption of investments	240,859	276,036	164,503
Investment in equity affiliate	(600)	(600)	0
Net cash used for investing activities	(119,099)	(11,997)	(96,546)
Cash flows from financing activities:
Principal payments of finance lease liabilities	(326)	(169)	(142)
Proceeds from borrowings	290,000	80,000	35,000
Repayments of borrowings	(201,250)	(130,000)	(45,000)
Payment of contingent consideration	(4,000)	(5,000)	0
Acquisition of treasury stock	(207,926)	(131,847)	(72,642)
Proceeds from issuance of common stock	5,023	5,566	1,060
Payment of debt issuance costs	(622)	0	0
Net cash used for financing activities	(119,101)	(181,450)	(81,724)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(4,328)	2,029	(6,060)
Net increase/(decrease) in cash, cash equivalents and restricted cash	25,997	19,780	(18,189)
Cash, cash equivalents and restricted cash at the beginning of the period	145,401	125,621	143,810
Cash, cash equivalents and restricted cash at the end of the period	171,398	145,401	125,621
Cash paid during the period for:
Interest	19,604	13,895	8,189
Income taxes	106,414	104,882	57,058
Supplemental disclosure of non-cash investing and financing activities:
Additions to property and equipment not yet paid	2,062	4,137	4,032
Assets acquired under finance lease	$ 1,325	$ 461	$ 312