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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income (loss) $ 93,640 $ 31,697
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 130,226 104,068
Amortization of financing costs and discounts 14,058 14,102
Non-cash operating lease costs 6,714 11,453
Share-based compensation 12,363 12,843
Provision for doubtful accounts 4,329 6,793
Deferred income taxes, net (11,853) 2,752
Gain on sale of businesses (2,802) 0
Lease asset impairments 7,829 2,141
Goodwill impairment on business 32,629 0
Changes in fair value of contingent consideration 562 (232)
Foreign currency remeasurement gain 415 (704)
(Income) loss from equity method investments (18,519) 10,090
Loss on equity and debt investments 16,677 20,826
Decrease (increase) in:    
Accounts receivable 65,312 63,675
Prepaid expenses and other current assets (7,720) (4,185)
Other assets (701) (300)
Increase (decrease) in:    
Accounts payable and accrued expenses (23,438) (34,682)
Income taxes payable (15,123) 7,376
Deferred revenue 2,499 (2,698)
Operating lease liabilities (13,529) (10,921)
Liability for uncertain tax positions (3,567) 5,114
Other long-term liabilities 21 2,419
Net cash provided by operating activities 290,022 241,627
Cash flows from investing activities:    
Proceeds on sale of available-for-sale investments 663 0
Purchases of equity method investment (11,053) (26,523)
Purchases of equity investments (999) (843)
Purchases of property and equipment (57,766) (50,537)
Proceeds from sale of assets 6,033 407
Acquisition of businesses, net of cash received (89,489) (19,349)
Purchases of intangible assets 0 (23)
Net cash used in investing activities (152,611) (96,868)
Cash flows from financing activities:    
Payment of debt (2,802) 0
Proceeds from line of credit 2,811 0
Repurchase of common stock (22,934) (88,469)
Issuance of common stock under employee stock purchase plan 4,232 3,303
Exercise of stock options 1,331 952
Deferred payments for acquisitions (12,934) (16,296)
Other (1,294) (1,032)
Net cash used in financing activities (31,590) (101,542)
Effect of exchange rate changes on cash and cash equivalents (616) (2,012)
Net change in cash and cash equivalents 105,205 41,205
Cash and cash equivalents at beginning of period 242,652 575,615
Cash and cash equivalents at end of period $ 347,857 $ 616,820