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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 150,668,000 $ 218,806,000 $ 128,687,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 228,737,000 232,032,000 187,174,000
Amortization of financing costs and discounts 28,476,000 14,038,000 11,385,000
Non-cash operating lease costs 17,686,000 21,419,000 0
Share-based compensation 24,006,000 23,922,000 28,093,000
Provision for doubtful accounts 13,283,000 13,134,000 17,338,000
Deferred income taxes, net 5,840,000 (63,444,000) 25,050,000
Loss on extinguishment of debt 37,969,000 0 0
Gain on sale of businesses (17,122,000) 0 0
Lease asset impairments and other charges 12,121,000 0 0
Changes in fair value of contingent consideration (80,000) 6,318,000 18,944,000
Foreign currency remeasurement gain (34,646,000) 0 0
Loss on equity method investments 11,338,000 139,000 10,506,000
Loss on equity and debt investments 20,826,000 4,164,000 0
Decrease (increase) in:      
Accounts receivable (31,611,000) (30,680,000) 4,034,000
Prepaid expenses and other current assets 3,046,000 (8,685,000) 2,211,000
Other assets (3,000) (4,083,000) 2,391,000
Increase (decrease) in:      
Accounts payable and accrued expenses 2,184,000 (770,000) (35,220,000)
Income taxes payable 6,489,000 (1,738,000) (29,042,000)
Deferred revenue 4,720,000 6,844,000 11,991,000
Operating lease liabilities (16,439,000) (20,240,000) 0
Liability for uncertain tax positions 9,391,000 (453,000) 7,694,000
Other long-term liabilities 3,200,000 1,816,000 10,089,000
Net cash provided by operating activities 480,079,000 412,539,000 401,325,000
Cash flows from investing activities:      
Distribution from equity method investment 0 10,288,000 0
Purchases of equity method investment (31,937,000) (29,584,000) (36,635,000)
Purchase of equity investments (1,246,000) 0 0
Purchases of available-for-sale investments 0 0 (500,000)
Purchases of property and equipment (92,552,000) (70,588,000) (56,379,000)
Proceeds from sale of assets 507,000 0 0
Acquisition of businesses, net of cash received (482,227,000) (415,343,000) (312,430,000)
Proceeds from sale of businesses, net of cash divested 24,353,000 0 0
Purchases of intangible assets (3,118,000) (46,000) (669,000)
Net cash used in investing activities (586,220,000) (505,273,000) (406,613,000)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 750,000,000 550,000,000 0
Payment of note payable (400,000) 0 0
Debt issuance cost (7,272,000) (12,862,000) 0
Payment of debt (650,000,000) (5,100,000) (2,204,000)
Debt extinguishment costs (29,250,000) 0 0
Proceeds from line of credit 0 185,000,000 0
Repayment of line of credit 0 (185,000,000) 0
Repurchase of common stock (275,654,000) (20,803,000) (47,102,000)
Issuance of common stock under employee stock purchase plan 7,382,000 4,512,000 2,084,000
Exercise of stock options 1,619,000 5,274,000 1,540,000
Dividends paid 0 (43,918,000) (82,572,000)
Deferred payments for acquisitions (29,180,000) (18,876,000) (3,558,000)
Other (1,878,000) (1,532,000) 450,000
Net cash (used in) provided by financing activities (234,633,000) 456,695,000 (131,362,000)
Effect of exchange rate changes on cash and cash equivalents 7,811,000 2,180,000 (4,821,000)
Net change in cash and cash equivalents (332,963,000) 366,141,000 (141,471,000)
Cash and cash equivalents at beginning of year 575,615,000 209,474,000 350,945,000
Cash and cash equivalents at end of year $ 242,652,000 $ 575,615,000 $ 209,474,000