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ACQUISITIONS (Supplemental Unaudited Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Income (Loss) per share: |  |  |  |
Effective income tax rate reconciliation, percent | 22.00% | 24.10% | 25.40% | 23.30%
L.J. Kushner & Associates, L.L.C. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 71,519 | $ 90,334 | $ 211,301 | $ 254,877
Gross profit | 19,712 | 26,143 | 57,801 | 73,466
Net income (loss) | $ 2,566 | $ 4,720 | $ (952) | $ 12,184
Income (Loss) per share: |  |  |  |
Basic pro forma (in usd per share) | $ 0.25 | $ 0.46 | $ (0.09) | $ 1.19
Diluted pro forma (in usd per share) | $ 0.25 | $ 0.46 | $ (0.09) | $ 1.18
Pro Forma |  |  |  |
Income (Loss) per share: |  |  |  |
Effective income tax rate reconciliation, percent | 22.00% |  |  |
Pro Forma | Revolving Credit Facility |  |  |  |
Income (Loss) per share: |  |  |  |
Line of credit facility, interest rate during period |  |  | 2.30% |

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