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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 45,126 | $ 33,133 | $ 25,237
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions: |  |  |
Depreciation and amortization | 14,494 | 12,051 | 10,574
Deferred income taxes | 7,282 | (4,652) | (1,063)
Stock-based compensation | 9,434 | 6,005 | 5,766
Amortization of debt issuance costs under the credit facility | 804 | 737 | 716
Provision for doubtful accounts | 962 | 918 | 343
Loss on sale and/or impairment of assets |  | 1,256 |
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | (3,916) | 23,860 | (37,478)
Prepaid expenses and other current assets | (8,599) | (1,973) | (792)
Government stimulus advances | (27,914) | 19,393 |
Accounts payable | (4,810) | 2,159 | 4,638
Accrued payroll | 7,888 | 5,228 | 8,138
Accrued expenses and other liabilities | (1,263) | 11,296 | (4,060)
Net cash provided by operating activities | 39,488 | 109,411 | 12,019
Cash flows from investing activities: |  |  |
Acquisitions of businesses, net of cash acquired | (37,370) | (207,660) | (184,076)
Proceeds on disposal of businesses |  | 255 |
Purchases of property and equipment | (4,645) | (6,831) | (4,621)
Net cash used in investing activities | (42,015) | (214,236) | (188,697)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs |  |  | 172,945
Borrowings on revolver — credit facility | 46,395 | 135,000 | 23,458
Borrowings on term loan — credit facility |  |  | 19,600
Payments on term loan — credit facility | (18,130) | (735) | (735)
Payments on financing lease obligations |  | (22) | (63)
Payments for debt issuance costs under the credit facility | (3,029) |  | (372)
Cash received from exercise of stock options | 1,108 | 3,946 | 3,153
Net cash provided by financing activities | 26,344 | 138,189 | 217,986
Net change in cash | 23,817 | 33,364 | 41,308
Cash, at beginning of period | 145,078 | 111,714 | 70,406
Cash, at end of period | 168,895 | 145,078 | 111,714
Supplemental disclosures of cash flow information: |  |  |
Cash paid for interest | 5,094 | 2,365 | 2,320
Cash paid for income taxes | 17,820 | 10,590 | 7,303
Supplemental disclosures of non-cash investing and financing activities |  |  |
Leasehold improvements acquired through tenant allowances |  | 5,161 | 682
Tax benefit related to the amortization of tax goodwill in excess of book basis | $ 61 | $ 225 | $ 117

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