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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

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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