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RESTRICTED CASH AND INVESTMENTS (Tables) | 9 Months Ended
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Sep. 26, 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) | September 26, 2021 | December 27, 2020
Cash collateral held by insurance carriers | $ | 28,682 |  | $ | 26,025 |
Cash and cash equivalents held in Trust | 27,370 |  | 29,410 |
Investments held in Trust | 132,127 |  | 152,247 |
Deferred compensation investments | 6,254 |  | 5,915 |
Company-owned life insurance policies | 28,281 |  | 26,267 |
Other restricted cash and cash equivalents | 1,118 |  | 670 |
Total restricted cash and investments | $ | 223,832 |  | $ | 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 September 26, 2021 and December 27, 2020, were as follows:
| September 26, 2021
(in thousands) | Amortized cost | Gross unrealized gains | Gross unrealized losses | Fair value
Municipal debt securities | $ | 58,719 |  | $ | 2,536 |  | $ | — |  | $ | 61,255 |
Corporate debt securities | 72,218 |  | 1,585 |  | (181) |  | 73,622 |
Agency mortgage-backed securities | 193 |  | 7 |  | — |  | 200 |
U.S. government and agency securities | 997 |  | 92 |  | — |  | 1,089 |
Total held-to-maturity investments | $ | 132,127 |  | $ | 4,220 |  | $ | (181) |  | $ | 136,166 |
| 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:
| September 26, 2021
(in thousands) | Amortized cost | Fair value
Due in one year or less | $ | 24,342 |  | $ | 24,572 |
Due after one year through five years | 103,803 |  | 107,368 |
Due after five years through ten years | 3,982 |  | 4,226 |
Total held-to-maturity investments | $ | 132,127 |  | $ | 136,166 |
Schedule of unrealized gain (loss) on equity investments | Unrealized gains and losses related to these investments still held at September 26, 2021 and September 27, 2020, included in selling, general and administrative expense on our Consolidated Statements of Operations and Comprehensive Income (Loss), were as follows:
| Thirteen weeks ended |  | Thirty-nine weeks ended
(in thousands) | September 26, 2021 | September 27, 2020 |  | September 26, 2021 | September 27, 2020
Unrealized gains (losses) | $ | 391 |  | $ | 1,452 |  |  | $ | 2,817 |  | $ | (258) |

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