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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income (loss) $ 77,922 $ (6,404)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 65,492 53,980
Amortization of financing costs and discounts 7,296 6,997
Non-cash operating lease costs 3,320 4,834
Share-based compensation 6,113 6,313
Provision for doubtful accounts 2,485 2,826
Deferred income taxes, net (5,380) (1,106)
Gain on sale of businesses (1,979) 0
Lease asset impairments 1,086 0
Changes in fair value of contingent consideration 510 (240)
Foreign currency remeasurement gain 655 7,801
(Income) loss from equity method investments (24,270) 4,269
Loss on equity and debt investments 0 20,826
Decrease (increase) in:    
Accounts receivable 68,564 52,949
Prepaid expenses and other current assets (2,481) (8,169)
Other assets 1,193 2,612
Increase (decrease) in:    
Accounts payable and accrued expenses (22,078) (43,374)
Income taxes payable 2,471 1,616
Deferred revenue 7,867 (686)
Operating lease liabilities (5,951) (5,062)
Liability for uncertain tax positions 1,304 1,654
Other long-term liabilities (5,415) 400
Net cash provided by operating activities 178,724 102,036
Cash flows from investing activities:    
Purchases of equity method investment (8,064) (22,840)
Purchases of equity investments (999) (843)
Purchases of property and equipment (26,269) (26,885)
Proceeds from sale of assets 0 226
Acquisition of businesses, net of cash received 385 (18,701)
Proceeds from sale of businesses, net of cash divested 5,999 0
Purchases of intangible assets (8) (19)
Net cash used in investing activities (28,956) (69,062)
Cash flows from financing activities:    
Repurchase of common stock (12,179) (62,966)
Exercise of stock options 444 952
Deferred payments for acquisitions (7,853) (15,503)
Other (551) (839)
Net cash used in financing activities (20,139) (78,356)
Effect of exchange rate changes on cash and cash equivalents (310) (3,679)
Net change in cash and cash equivalents 129,319 (49,061)
Cash and cash equivalents at beginning of period 242,652 575,615
Cash and cash equivalents at end of period $ 371,971 $ 526,554