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SUPPLEMENTAL CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Information | Supplemental cash flow information was as follows:
Years Ended December 31, |  | 2018 |  |  | 2017 |  |  | 2016 |
Interest paid |  | $ | 3,065 |  |  | $ | 5,773 |  |  | $ | 3,362 |
Income taxes net of refunds |  | $ | 115,301 |  |  | $ | 48,056 |  |  | $ | 99,006 |
Common stock issued for Alert Labs Inc. |  | $ | 6,846 |  |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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