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SUPPLEMENTAL CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
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 Schedule Of Cash Flow Supplemental Disclosure. + References No definition available. + Details
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