Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flow from operating activities:
Net income from consolidated operations	$ 141,923	$ 506,239	$ 214,310
Adjustments to reconcile net income to net cash provided by operating activities:
Equity-based compensation	32,640	15,882	8,157
Depreciation and amortization	32,662	11,004	2,962
Provision for credit losses	32,596	8,931	1,170
Noncash lease expense	4,913	1,154	409
Loss on disposal of fixed asset	502	850	672
Amortization of premium of marketable securities	4,767	7,596	857
Deferred taxes	(8,280)	(8,188)	(1,775)
Unrecognized tax benefits	9,111	348	377
Net loss on marketable securities	692	1,186	90
Equity loss in investee			488
(Gain) loss on equity-method investments		(3,734)	4,354
Other	(11)	(15)	8
Changes in operating assets and liabilities:
Trade accounts receivable	68,638	42,300	(178,480)
Other current and long-term assets	(4,337)	7,804	(21,149)
Accounts payable	(25,339)	(12,206)	22,617
Accrued liabilities and other liabilities	(31,299)	13,081	32,655
Income tax payable	(827)	(52,532)	53,295
Operating and finance lease liabilities	(4,831)	(1,123)	(389)
Net cash provided by operating activities	253,520	538,577	140,628
Cash flow from investing activities:
Purchases of fixed assets	(18,775)	(23,812)	(35,130)
Purchases of intangible assets		(32)
Proceeds from sale of fixed assets	412	63	8
Purchase of marketable securities	(417,982)	(710,490)	(324,359)
Purchase of preferred stock of privately held company	(15,000)
Contingent consideration payout related to a business acquisition	(10,000)
Purchase of redeemable preferred stock		(20,000)
Maturities of marketable securities	232,534	83,842	19,919
Proceeds from sale of marketable securities	140,176	185,749	17,095
Acquisition of businesses, net of cash acquired	(172,679)	(61,868)
Investment in equity-method investees			(3,971)
Net cash used in investing activities	(261,314)	(546,548)	(326,438)
Cash flow from financing activities:
Repurchase of common stock	(74,337)
Common stock withholding for employee tax obligations	(1,768)	(4,155)	(62)
Proceeds from public offerings of common stock, net of issuance costs		89,475	246,190
Proceeds from noncontrolling interest		10
Proceeds from exercise of stock options	31	86	104
Principal paid for finance leases	(700)	(7)
Repayment of notes payable	(367)	(4)
Borrowing under margin account			15,019
Net cash (used in) provided by financing activities	(77,141)	85,405	261,251
Effect of exchange rate changes on cash and cash equivalents	(453)	34	20
Net (decrease) increase in cash and cash equivalents	(85,388)	77,468	75,461
Cash and cash equivalents at beginning of period	164,894	87,426	11,965
Cash and cash equivalents at end of period	79,506	164,894	87,426
Supplemental disclosures of cash flow information:
Income taxes paid	56,193	237,069	20,612
Supplemental disclosures of non-cash investing and financing activities:
Stock consideration in a business combination	28,111
Maturities of marketable securities in other current assets	19,120
Purchases of fixed assets in notes payable	3,833
Purchases of fixed assets in accounts payable	2,989	1,075	3,402
Finance lease right-of-use assets obtained in exchange for lease liabilities	573	1,693
Operating lease right-of-use assets reduced due to lease modification or termination	66	399	1,853
Operating lease right-of-use assets obtained in exchange for lease liabilities	$ 52	1,797	402
Contingent consideration for business acquisition included in current liabilities		10,000
Public offerings proceeds in other receivable included in other current assets			17,799
Public offerings costs included in accounts payable		$ 5	$ 359