CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 41,503	$ 63,757	$ 496,714
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	236,966	233,400	258,303
Non-cash operating lease costs	11,141	13,412	1,485
Share-based compensation	31,920	26,601	25,248
Provision for credit losses (benefit) on accounts receivable	2,809	(255)	8,738
Deferred income taxes, net	(30,017)	(12,991)	(13,433)
(Gain) loss on extinguishment of debt, net	0	(11,505)	14,024
Loss on sale of businesses	0	0	21,798
Goodwill impairment on business	56,850	27,369	32,629
Changes in fair value of contingent consideration	(200)	(2,575)	(1,223)
Loss (income) from equity method investments	9,329	7,730	(35,845)
Unrealized loss (gain) on short-term investments held at the reporting date	28,495	7,145	(298,490)
Gain (loss) on investments, net	(357)	46,743	16,677
Other	5,159	3,637	39,270
Decrease (increase) in:
Accounts receivable	(35,371)	14,948	(18,050)
Prepaid expenses and other current assets	(8,700)	9,665	(15,650)
Other assets	(5,574)	(16,240)	11,443
Increase (decrease) in:
Accounts payable (includes $0, $0 and $17,635 with related parties)	9,419	(20,246)	479
Deferred revenue	(6,802)	(20,962)	14,282
Accrued liabilities and other current liabilities	(26,608)	(33,189)	(41,863)
Net cash provided by operating activities	319,962	336,444	516,536
Cash flows from investing activities:
Purchases of property and equipment	(108,729)	(106,154)	(113,740)
Proceeds on sale of available-for-sale investments	0	0	663
Investment in available-for-sale securities	0	(15,000)	0
Distribution from equity method investment	0	0	15,327
Purchases of equity method investment	0	0	(23,249)
Purchase of equity investments	(11,858)	0	(999)
Proceeds from sale of equity investments	3,174	4,527	14,330
Acquisition of businesses, net of cash received	(9,492)	(104,094)	(141,146)
Proceeds from sale of businesses, net of cash divested	0	0	48,876
Proceeds from divestiture of discontinued operations	0	0	259,104
Other	(503)	(50)	(78)
Net cash (used in) provided by investing activities	(127,408)	(220,771)	59,088
Cash flows from financing activities:
Proceeds from bridge loan	0	0	485,000
Payment of debt	0	(166,904)	(512,388)
Debt extinguishment costs (includes reimbursement of $0, $0 and $7,500 with related parties)	0	(756)	(1,096)
Proceeds from term loan	0	112,286	0
Repurchase of common stock	(108,527)	(78,291)	(78,327)
Issuance of common stock under employee stock purchase plan	8,727	9,431	9,231
Proceeds from exercise of stock options	0	148	2,939
Deferred payments for acquisitions	(15,241)	(16,116)	(14,387)
Other	250	(630)	(4,060)
Net cash used in financing activities	(114,791)	(140,832)	(113,088)
Effect of exchange rate changes on cash and cash equivalents	7,056	(16,890)	(10,346)
Net change in cash and cash equivalents	84,819	(42,049)	452,190
Cash and cash equivalents at beginning of year	652,793	694,842	242,652
Cash and cash equivalents at beginning of year associated with discontinued operations	0	0	66,210
Cash and cash equivalents at beginning of year associated with continuing operations	652,793	694,842	176,442
Cash and cash equivalents at end of year	737,612	652,793	694,842
Cash and cash equivalents at end of year associated with discontinued operations	0	0	0
Cash and cash equivalents at end of year associated with continuing operations	$ 737,612	$ 652,793	$ 694,842