Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 100,399	$ 72,024
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	26,464	27,739
Stock-based compensation expense	25,918	24,564
Amortization of operating lease right-of-use assets	10,332	12,005
Unrealized (gain)/loss on investments	7,222	(275)
Unrealized foreign currency exchange (gain)/loss, net	1,288	(10,280)
Deferred income tax benefit	(18,283)	(1,462)
Allowance for expected credit losses	479	170
Fair value changes in contingent consideration	0	1,000
Others, net	1,202	526
Change in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(28,375)	(46,385)
Other current assets	(4,387)	2,861
Income taxes payable, net	(10,610)	8,684
Other assets	(12,772)	(6,584)
Accounts payable	(4,796)	(1,107)
Deferred revenue	5,380	4,276
Accrued employee costs	(24,331)	(34,016)
Accrued expenses and other liabilities	(742)	11,190
Operating lease liabilities	(10,829)	(11,922)
Net cash provided by operating activities	63,559	53,008
Cash flows from investing activities:
Purchases of property and equipment	(26,113)	(25,054)
Proceeds from sale of property and equipment	547	154
Business acquisition (net of cash and cash equivalents acquired)	0	(2,572)
Purchases of investments	(113,823)	(96,082)
Proceeds from redemption of investments	151,178	82,567
Net cash provided by/(used for) investing activities	11,789	(40,987)
Cash flows from financing activities:
Principal payments of finance lease liabilities	(80)	(75)
Proceeds from borrowings	70,000	35,000
Repayments of borrowings	(100,000)	(10,000)
Acquisition of treasury stock	(70,638)	(60,191)
Payment of contingent consideration	(5,000)	0
Proceeds from ESPP contribution	3,800	0
Proceeds from exercise of stock options	85	0
Net cash used for financing activities	(101,833)	(35,266)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,524	(5,365)
Net decrease in cash, cash equivalents and restricted cash	(24,961)	(28,610)
Cash, cash equivalents and restricted cash at the beginning of the period	125,621	143,810
Cash, cash equivalents and restricted cash at the end of the period	100,660	115,200
Cash paid during the period for:
Interest	6,914	2,694
Income taxes, net of refunds	53,299	14,301
Supplemental disclosure of non-cash investing and financing activities:
Assets acquired under finance lease	$ 91	$ 118