Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net (loss) income	$ (21,899)	$ 93,640
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	118,943	130,226
Amortization of financing costs and discounts	1,398	14,058
Non-cash operating lease costs	5,913	6,714
Share-based compensation	14,420	12,363
Provision for credit losses on accounts receivable	(1,376)	4,329
Deferred income taxes, net	(10,266)	(11,853)
Gain on extinguishment of debt, net	(1,393)	0
Gain on sale of businesses	0	(2,802)
Lease asset impairments and other charges	168	7,829
Goodwill impairment on business	0	32,629
Changes in fair value of contingent consideration	(9)	562
Foreign currency remeasurement gain	549	415
Loss (income) from equity method investments	6,886	(18,519)
Unrealized loss on short-term investments	18,366	0
Loss on investments, net	48,243	16,677
Decrease (increase) in:
Accounts receivable (includes $8,351 and $0 with related parties)	77,168	65,312
Prepaid expenses and other current assets	5,804	(7,720)
Operating lease right-of-use assets	2,260	689
Other assets	(7,250)	(701)
Increase (decrease) in:
Accounts payable and accrued expenses	(45,329)	(23,438)
Income taxes payable	8,825	(15,123)
Deferred revenue	(11,882)	2,499
Operating lease liabilities	(13,721)	(14,218)
Liability for uncertain tax positions	403	(3,567)
Other long-term liabilities	(3,737)	21
Net cash provided by operating activities	192,484	290,022
Cash flows from investing activities:
Proceeds from sale of available-for-sale investments	0	663
Investment in available-for-sale securities	(15,000)	0
Purchases of equity method investment	0	(11,053)
Purchases of equity investments	0	(999)
Purchases of property and equipment	(53,876)	(57,766)
Proceeds from sale of assets	0	6,033
Acquisition of businesses, net of cash received	(92,425)	(89,489)
Net cash used in investing activities	(161,301)	(152,611)
Cash flows from financing activities:
Payment of debt	(72,853)	(2,802)
Proceeds from term loan	89,991	2,811
Debt extinguishment costs	(756)	0
Repurchase of common stock	(76,345)	(22,934)
Issuance of common stock under employee stock purchase plan	5,235	4,232
Exercise of stock options	148	1,331
Deferred payments for acquisitions	(7,094)	(12,934)
Other	(5)	(1,294)
Net cash used in financing activities	(61,679)	(31,590)
Effect of exchange rate changes on cash and cash equivalents	(16,056)	(616)
Net change in cash and cash equivalents	(46,552)	105,205
Cash and cash equivalents at beginning of period	694,842	242,652
Cash and cash equivalents at beginning of period associated with discontinued operations	0	66,210
Cash and cash equivalents at beginning of period associated with continuing operations	694,842	176,442
Cash and cash equivalents at end of period	648,290	347,857
Cash and cash equivalents at end of period associated with discontinued operations	0	107,666
Cash and cash equivalents at end of period associated with continuing operations	$ 648,290	$ 240,191