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SUPPLEMENTAL CASH FLOW INFORMATION | 12 Months Ended
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Dec. 31, 2020
SUPPLEMENTAL CASH FLOW INFORMATION | 22. SUPPLEMENTAL CASH FLOW INFORMATION Supplemental cash flow information was as follows:
Years Ended December 31, |  | 2020 |  |  | 2019 |  |  | 2018 |
Interest paid |  | $ | 1,844 |  |  | $ | 4,341 |  |  | $ | 3,065 |
Income taxes net of refunds |  | $ | 70,889 |  |  | $ | 70,095 |  |  | $ | 115,301 |
Common stock issued for N&S Supply of Fishkill, Inc. |  | $ | (161 | ) |  | $ | 4,032 |  |  |  | — |
Common stock issued for Peirce-Phelps, Inc. |  |  | — |  |  | $ | 58,344 |  |  |  | — |
Common stock issued for Dunphey & Associates Supply Co., Inc. |  |  | — |  |  | $ | 6,891 |  |  |  | — |
Common stock issued for Alert Labs, Inc. |  |  | — |  |  |  | — |  |  | $ | 6,846 |

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details
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