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RESTRICTED CASH AND INVESTMENTS (Tables) | 6 Months Ended
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Jul. 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) | July 1, 2018 | December 31, 2017
Cash collateral held by insurance carriers | $ | 22,726 |  | $ | 22,926 |
Cash and cash equivalents held in Trust | 25,447 |  | 16,113 |
Investments held in Trust | 166,424 |  | 171,752 |
Deferred compensation mutual funds | 24,384 |  | 22,428 |
Other restricted cash and cash equivalents | 409 |  | 6,012 |
Total restricted cash and investments | $ | 239,390 |  | $ | 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 are as follows:
| July 1, 2018
(in thousands) | Amortized cost | Gross unrealized gains | Gross unrealized losses | Fair value
Municipal debt securities | $ | 78,675 |  | $ | 304 |  | $ | (789 | ) | $ | 78,190 |
Corporate debt securities | 83,481 |  | 5 |  | (1,248 | ) | 82,238 |
Agency mortgage-backed securities | 3,269 |  | 6 |  | (46 | ) | 3,229 |
U.S. government and agency securities | 999 |  | — |  | (24 | ) | 975 |
Total held-to-maturity investments | $ | 166,424 |  | $ | 315 |  | $ | (2,107 | ) | $ | 164,632 |
| December 31, 2017
(in thousands) | Amortized cost | Gross unrealized gains | Gross unrealized losses | 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 July 1, 2018 and December 31, 2017, were as follows:
| July 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 | $ | 37,263 |  | $ | (350 | ) |  | $ | 9,329 |  | $ | (439 | ) |  | $ | 46,592 |  | $ | (789 | )
Corporate debt securities | 69,369 |  | (1,042 | ) |  | 8,980 |  | (206 | ) |  | 78,349 |  | (1,248 | )
Agency mortgage-backed securities | 1,397 |  | (15 | ) |  | 976 |  | (31 | ) |  | 2,373 |  | (46 | )
U.S. government and agency securities | 975 |  | (24 | ) |  | — |  | — |  |  | 975 |  | (24 | )
Total held-to-maturity investments | $ | 109,004 |  | $ | (1,431 | ) |  | $ | 19,285 |  | $ | (676 | ) |  | $ | 128,289 |  | $ | (2,107 | )
| 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:
| July 1, 2018
(in thousands) | Amortized cost | Fair value
Due in one year or less | $ | 24,233 |  | $ | 24,101 |
Due after one year through five years | 91,941 |  | 91,148 |
Due after five years through ten years | 50,250 |  | 49,383 |
Total held-to-maturity investments | $ | 166,424 |  | $ | 164,632 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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