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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 496,714 $ 150,668 $ 218,806
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 258,303 228,737 232,032
Amortization of financing costs and discounts 26,090 28,476 14,038
Non-cash operating lease costs 1,485 17,686 21,419
Share-based compensation 25,248 24,006 23,922
Provision for doubtful accounts 8,738 13,283 13,134
Deferred income taxes, net (13,433) 5,840 (63,444)
Loss on extinguishment of debt 14,024 37,969 0
Loss (gain) on sale of businesses 21,798 (17,122) 0
Lease asset impairments and other charges 12,710 12,121 0
Goodwill impairment on business 32,629 0 0
Changes in fair value of contingent consideration (1,223) (80) 6,318
Foreign currency remeasurement gain 184 (34,646) 0
(Income) loss from equity method investments, net (35,845) 11,338 139
(Gain) loss on equity and debt investments (281,527) 20,826 4,164
Decrease (increase) in:      
Accounts receivable (18,050) (31,611) (30,680)
Prepaid expenses and other current assets (15,650) 3,046 (8,685)
Other assets (3,824) (3) (4,083)
Increase (decrease) in:      
Accounts payable and accrued expenses (includes $17,635, $0 and $0 with related parties) 22,262 2,184 (770)
Income taxes payable (21,783) 6,489 (1,738)
Deferred revenue 14,282 4,720 6,844
Operating lease liabilities (15,314) (16,439) (20,240)
Liability for uncertain tax positions (10,383) 9,391 (453)
Other long-term liabilities (899) 3,200 1,816
Net cash provided by operating activities 516,536 480,079 412,539
Cash flows from investing activities:      
Proceeds on sale of available-for-sale investments 663 0 0
Distribution from equity method investment 15,327 0 10,288
Purchases of equity method investment (23,249) (31,937) (29,584)
Purchase of equity investments (999) (1,246) 0
Proceeds from sale of equity investments 14,330 0 0
Purchases of property and equipment (113,740) (92,552) (70,588)
Proceeds from sale of assets 0 507 0
Acquisition of businesses, net of cash received (141,146) (482,227) (415,343)
Proceeds from sale of businesses, net of cash divested 48,876 24,353 0
Purchases of intangible assets (78) (3,118) (46)
Proceeds from divestiture of discontinued operations 259,104 0 0
Net cash provided by (used in) investing activities 59,088 (586,220) (505,273)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 0 750,000 550,000
Payment of note payable 0 (400) 0
Proceeds from bridge loan 485,000 0 0
Debt issuance cost 0 (7,272) (12,862)
Payment of debt (512,388) (650,000) (5,100)
Debt extinguishment costs (includes reimbursement of $7,500, $0 and $0 with related parties) (1,096) (29,250) 0
Proceeds from line of credit 0 0 185,000
Repayment of line of credit 0 0 (185,000)
Repurchase of common stock (78,327) (275,654) (20,803)
Issuance of common stock under employee stock purchase plan 9,231 7,382 4,512
Exercise of stock options 2,939 1,619 5,274
Dividends paid 0 0 (43,918)
Deferred payments for acquisitions (14,387) (29,180) (18,876)
Other (4,060) (1,878) (1,532)
Net cash (used in) provided by financing activities (113,088) (234,633) 456,695
Effect of exchange rate changes on cash and cash equivalents (10,346) 7,811 2,180
Net change in cash and cash equivalents 452,190 (332,963) 366,141
Cash and cash equivalents at beginning of year 242,652 575,615 209,474
Cash and cash equivalents at beginning of year associated with discontinued operations 66,210 51,141 73,952
Cash and cash equivalents at beginning of year associated with continuing operations 176,442 524,474 135,522
Cash and cash equivalents at end of year 694,842 242,652 575,615
Cash and cash equivalents at end of year associated with discontinued operations 0 66,210 51,141
Cash and cash equivalents at end of year associated with continuing operations $ 694,842 $ 176,442 $ 524,474