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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities |  |
Net income | $ 54,504 | $ 41,325
Adjustments to reconcile net income to net cash provided by operating activities |  |
Depreciation and amortization of property and equipment | 21,570 | 20,623
Amortization of operating lease right-of-use assets | 10,549 | 8,545
Amortization of intangibles | 17,574 | 13,404
Amortization of deferred financing costs and debt discount | 663 | 670
Provision for credit losses | 102 | 2,668
Gain on sale of property and equipment | (560) | (144)
Noncash stock compensation | 6,693 | 5,415
Deferred income taxes | 0 | (1,679)
Amortization of terminated interest rate swap |  | 0
Changes in assets and liabilities, excluding effects of acquisitions |  |
Accounts receivable | (3,953) | (3,158)
Inventories | (19,973) | 6,072
Other assets | (1,225) | 9,351
Accounts payable | 3,724 | (18,504)
Income taxes receivable/payable | (297) | 16,015
Other liabilities | (7,538) | 4,922
Net cash provided by operating activities | 83,435 | 105,525
Cash flows from investing activities |  |
Purchases of investments | 0 | (776)
Maturities of short term investments | 0 | 22,050
Purchases of property and equipment | (20,278) | (16,345)
Acquisitions of businesses, net of cash acquired of $168 and $0 in 2021 and 2020, respectively | (67,715) | (12,625)
Proceeds from sale of property and equipment | 1,112 | 314
Other | (5) | (1,340)
Net cash used in investing activities | (86,886) | (8,722)
Cash flows from financing activities |  |
Proceeds from vehicle and equipment notes payable | 15,103 | 12,768
Debt issuance costs | 0 | (157)
Principal payments on long-term debt | (13,012) | (13,205)
Principal payments on finance lease obligations | (1,041) | (1,392)
Dividends paid | (17,607) | 0
Acquisition-related obligations | (2,050) | (3,486)
Surrender of common stock awards by employees | 0 | (15,759)
Net cash used in financing activities | (24,158) | (22,204)
Net change in cash and cash equivalents | (27,609) | 74,599
Cash and cash equivalents at beginning of period | 231,520 | 177,889
Cash and cash equivalents at end of period | 203,911 | 252,488
Supplemental disclosures of cash flow information |  |
Interest | 12,899 | 13,006
Income taxes, net of refunds | 15,288 | 476
Supplemental disclosure of noncash activities |  |
Right-of-use assets obtained in exchange for operating lease obligations | 16,967 | 10,229
Release of indemnification of acquisition-related debt | 2,036 | 0
Property and equipment obtained in exchange for finance lease obligations | 1,134 | 600
Seller obligations in connection with acquisition of businesses | 12,954 | 4,037
Unpaid purchases of property and equipment included in accounts payable | 886 | 1,981
Common Stock Awards |  |
Cash flows from financing activities |  |
Surrender of common stock awards by employees | $ (5,551) | $ (973)

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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