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RESTRICTED CASH AND INVESTMENTS (Tables) | 3 Months Ended
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Apr. 01, 2018
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) | April 1, 2018 | December 31, 2017
Cash collateral held by insurance carriers | $ | 23,035 |  | $ | 22,926 |
Cash and cash equivalents held in Trust | 28,981 |  | 16,113 |
Investments held in Trust | 166,255 |  | 171,752 |
Deferred compensation mutual funds | 24,093 |  | 22,428 |
Other restricted cash and cash equivalents | 402 |  | 6,012 |
Total restricted cash and investments | $ | 242,766 |  | $ | 239,231 |
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 April 1, 2018 and December 31, 2017, were as follows:
| April 1, 2018
(in thousands) | Amortized cost | Gross unrealized gain | Gross unrealized loss | Fair value
Municipal debt securities | $ | 79,291 |  | $ | 262 |  | $ | (910 | ) | $ | 78,643 |
Corporate debt securities | 82,302 |  | 20 |  | (1,140 | ) | 81,182 |
Agency mortgage-backed securities | 3,663 |  | 12 |  | (45 | ) | 3,630 |
U.S. government and agency securities | 999 |  | — |  | (8 | ) | 991 |
Total held-to-maturity investments | $ | 166,255 |  | $ | 294 |  | $ | (2,103 | ) | $ | 164,446 |
| December 31, 2017
(in thousands) | Amortized cost | Gross unrealized gain | Gross unrealized loss | Fair value
Municipal debt securities | $ | 82,770 |  | $ | 974 |  | $ | (378 | ) | $ | 83,366 |
Corporate debt securities | 83,916 |  | 309 |  | (434 | ) | 83,791 |
Agency mortgage-backed securities | 4,066 |  | 22 |  | (26 | ) | 4,062 |
U.S. government and agency securities | 1,000 |  | 19 |  | — |  | 1,019 |
Total held-to-maturity investments | $ | 171,752 |  | $ | 1,324 |  | $ | (838 | ) | $ | 172,238 |
Schedule of continuous unrealized loss position | The estimated fair value and gross unrealized losses of all investments classified as held-to-maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of April 1, 2018 and December 31, 2017, were as follows:
| April 1, 2018
| Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Estimated fair value | Unrealized losses |  | Estimated fair value | Unrealized losses |  | Estimated fair value | Unrealized losses
Municipal debt securities | $ | 42,461 |  | $ | (452 | ) |  | $ | 9,369 |  | $ | (458 | ) |  | $ | 51,830 |  | $ | (910 | )
Corporate debt securities | 66,664 |  | (927 | ) |  | 9,982 |  | (213 | ) |  | 76,646 |  | (1,140 | )
Agency mortgage-backed securities | 1,216 |  | (22 | ) |  | 802 |  | (23 | ) |  | 2,018 |  | (45 | )
U.S. government and agency securities | 991 |  | (8 | ) |  | — |  | — |  |  | 991 |  | (8 | )
Total held-to-maturity investments | $ | 111,332 |  | $ | (1,409 | ) |  | $ | 20,153 |  | $ | (694 | ) |  | $ | 131,485 |  | $ | (2,103 | )
| December 31, 2017
| Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Estimated fair value | Unrealized losses |  | Estimated fair value | Unrealized losses |  | Estimated fair value | Unrealized losses
Municipal debt securities | $ | 23,078 |  | $ | (124 | ) |  | $ | 9,631 |  | $ | (254 | ) |  | $ | 32,709 |  | $ | (378 | )
Corporate debt securities | 48,952 |  | (311 | ) |  | 10,081 |  | (123 | ) |  | 59,033 |  | (434 | )
Agency mortgage-backed securities | 1,362 |  | (10 | ) |  | 888 |  | (16 | ) |  | 2,250 |  | (26 | )
Total held-to-maturity investments | $ | 73,392 |  | $ | (445 | ) |  | $ | 20,600 |  | $ | (393 | ) |  | $ | 93,992 |  | $ | (838 | )
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:
| April 1, 2018
(in thousands) | Amortized cost | Fair value
Due in one year or less | $ | 17,960 |  | $ | 17,892 |
Due after one year through five years | 86,743 |  | 85,910 |
Due after five years through ten years | 61,552 |  | 60,644 |
Total held-to-maturity investments | $ | 166,255 |  | $ | 164,446 |

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