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RESTRICTED CASH AND INVESTMENTS (Tables) | 3 Months Ended
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Mar. 28, 2021
Restricted Cash and Investments [Abstract] |
Schedule of restricted cash and investments | The following is a summary of the carrying value of our restricted cash and investments:
(in thousands) | March 28, 2021 | December 27, 2020
Cash collateral held by insurance carriers | $ | 26,745 |  | $ | 26,025 |
Cash and cash equivalents held in Trust | 25,586 |  | 29,410 |
Investments held in Trust | 145,244 |  | 152,247 |
Deferred compensation investments | 5,821 |  | 5,915 |
Company owned life insurance policies | 26,950 |  | 26,267 |
Other restricted cash and cash equivalents | 832 |  | 670 |
Total restricted cash and investments | $ | 231,178 |  | $ | 240,534 |
Schedule of held-to-maturity investments | The amortized cost and estimated fair value of our held-to-maturity investments held in Trust, aggregated by investment category as of March 28, 2021 and December 27, 2020, were as follows:
| March 28, 2021
(in thousands) | Amortized cost | Gross unrealized gains | Gross unrealized losses | Fair value
Municipal debt securities | $ | 65,840 |  | $ | 2,880 |  | $ | — |  | $ | 68,720 |
Corporate debt securities | 78,056 |  | 1,974 |  | (276) |  | 79,754 |
Agency mortgage-backed securities | 351 |  | 14 |  | — |  | 365 |
U.S. government and agency securities | 997 |  | 100 |  | — |  | 1,097 |
Total held-to-maturity investments | $ | 145,244 |  | $ | 4,968 |  | $ | (276) |  | $ | 149,936 |
| December 27, 2020
(in thousands) | Amortized cost | Gross unrealized gains | Gross unrealized losses | Fair value
Municipal debt securities | $ | 67,287 |  | $ | 3,436 |  | $ | — |  | $ | 70,723 |
Corporate debt securities | 83,467 |  | 2,511 |  | (41) |  | 85,937 |
Agency mortgage-backed securities | 493 |  | 19 |  | — |  | 512 |
U.S. government and agency securities | 1,000 |  | 124 |  | — |  | 1,124 |
Total held-to-maturity investments | $ | 152,247 |  | $ | 6,090 |  | $ | (41) |  | $ | 158,296 |
Schedule of held-to-maturity investments by contractual maturity | The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows:
| March 28, 2021
(in thousands) | Amortized cost | Fair value
Due in one year or less | $ | 22,519 |  | $ | 22,675 |
Due after one year through five years | 109,541 |  | 113,285 |
Due after five years through ten years | 13,184 |  | 13,976 |
Total held-to-maturity investments | $ | 145,244 |  | $ | 149,936 |
Schedule of unrealized gain (loss) on equity investments | Unrealized gains and losses related to these investments still held at March 28, 2021 and March 29, 2020, included in selling general and administrative expense on our Consolidated Statements of Operations and Comprehensive Income (Loss), were as follows:
|  |  | Thirteen weeks ended
(in thousands) |  |  |  | March 28, 2021 | March 29, 2020
Unrealized gains (losses) |  |  |  | $ | 877 |  | $ | (4,841) |

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