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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 171,474,000 | $ 73,559,000 | $ 107,171,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 130,629,000 | 123,679,000 | 116,887,000
Deferred taxes | (3,992,000) | 7,463,000 | 1,821,000
Compensation expense related to share-based compensation plans | 20,056,000 | 17,053,000 | 16,286,000
(Gain) loss on sale of assets | (19,173,000) | 907,000 | (745,000)
Other operating activities |  | 6,385,000 | 0
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Restricted investments | (903,000) | (752,000) | (3,365,000)
Accounts receivable, net | (115,568,000) | (47,219,000) | 32,732,000
Prepaid taxes | (856,000) | (707,000) | (14,000)
Prepaid expenses and other current assets | (647,000) | (2,508,000) | 3,447,000
Other assets | (2,883,000) | (2,177,000) | (3,786,000)
Accounts payable | 78,448,000 | 5,594,000 | (14,933,000)
Accrued expenses | 9,686,000 | (4,408,000) | (122,000)
Non-current liabilities | (13,436,000) | (1,915,000) | (870,000)
Net cash provided by operating activities | 252,835,000 | 174,954,000 | 254,509,000
Cash flows from investing activities: |  |  |
Proceeds from sale of equipment | 45,177,000 | 3,289,000 | 10,025,000
Purchases of property and equipment | (132,952,000) | (115,306,000) | (94,847,000)
Acquisitions, net of cash acquired | (122,360,000) | (84,845,000) | (734,000)
Proceeds from the disposition of discontinued operations | 0 | 0 | 19,439,000
Net cash used in investing activities | (210,135,000) | (196,862,000) | (66,117,000)
Cash flows from financing activities: |  |  |
Proceeds from issuance of debt | 112,001,000 | 187,475,000 | 56,494,000
Repayments of long-term debt | (107,608,000) | (198,741,000) | (105,653,000)
Stock tendered for payments of withholding taxes | (9,123,000) | (7,963,000) | (3,984,000)
Purchase of treasury stock | 0 | 0 | (24,998,000)
Finance lease payments | (2,682,000) | (3,066,000) | (2,954,000)
Net cash used in financing activities | (7,412,000) | (22,295,000) | (81,095,000)
Effect of exchange rate changes on cash and cash equivalents | (10,000) | (20,000) | (3,000)
Net increase (decrease) in cash and cash equivalents | 35,278,000 | (44,223,000) | 107,294,000
Cash and cash equivalents beginning of the year | 124,506,000 | 168,729,000 | 61,435,000
Cash and cash equivalents end of the year | 159,784,000 | 124,506,000 | 168,729,000
Supplemental disclosures of cash paid for: |  |  |
Interest | 7,602,000 | 9,458,000 | 11,262,000
Income taxes | $ 58,593,000 | $ 18,388,000 | $ 40,289,000

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