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Investments | 12 Months Ended
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Dec. 31, 2022
Investments | (4) Investments Investments include primarily investment-grade corporate bonds and asset-backed securities having maturities of up to five years (the “bond portfolio”) and money market investments. Investments in the bond portfolio are reported as available-for-sale and are carried at fair value. Investments maturing less than one year from the balance sheet date are included in short-term investments and investments maturing more than one year from the balance sheet date are included in other assets in the consolidated balance sheets. Management performs an analysis of the nature of the unrealized losses on available-for-sale investments to determine whether an allowance for credit loss is necessary. Unrealized losses, representing the excess of the purchase price of an investment over its fair value as of the end of a period, considered to be a result of credit-related factors, are to be included as a charge in the statement of income, while unrealized losses considered to be a result of non-credit-related factors are to be included as a component of shareholders’ equity. Investments whose values are based on quoted market prices in active markets are classified within Level 1. Investments that trade in markets that are not considered to be active, but are valued based on quoted market prices, are classified within Level 2. As Level 2 investments include positions that are not traded in active markets, valuations may be adjusted to reflect illiquidity and/or non-transferability, which are generally based on available market information. Any transfers between levels are recognized as of the beginning of any reporting period. Fair value of the bond portfolio was determined using Level 1 inputs related to U.S. Treasury obligations and money market investments and Level 2 inputs related to investment-grade corporate bonds, asset-backed securities and direct obligations of government agencies. Unrealized losses, net of unrealized gains, on the investments in the bond portfolio were $10,763,000 at December 31, 2022, while unrealized gains, net of unrealized losses, on the investments in the bond portfolio were $144,000 at December 25, 2021. The amortized cost and fair values of available-for-sale investments are as follows at December 31, 2022 and December 25, 2021 (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments |  | $ | 21,910 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,910 |
Asset-backed securities |  |  | 18,905 |  |  |  | — |  |  |  | 2,889 |  |  |  | 16,016 |
Corporate bonds and direct obligations of government agencies |  |  | 126,134 |  |  |  | 1 |  |  |  | 7,775 |  |  |  | 118,360 |
U.S. Treasury obligations |  |  | 2,344 |  |  |  | — |  |  |  | 100 |  |  |  | 2,244 |
Total |  | $ | 169,293 |  |  | $ | 1 |  |  | $ | 10,764 |  |  | $ | 158,530 |
December 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market investments |  | $ | 8,750 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,750 |
Asset-backed securities |  |  | 22,441 |  |  |  | — |  |  |  | 346 |  |  |  | 22,095 |
Corporate bonds and direct obligations of government agencies |  |  | 137,916 |  |  |  | 1,406 |  |  |  | 966 |  |  |  | 138,356 |
U.S. Treasury obligations |  |  | 2,342 |  |  |  | 50 |  |  |  | — |  |  |  | 2,392 |
Total |  | $ | 171,449 |  |  | $ | 1,456 |  |  | $ | 1,312 |  |  | $ | 171,593 |
For those available-for-sale investments with unrealized losses at December 31, 2022 and December 25, 2021, the following table summarizes the duration of the unrealized loss (in thousands):
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | — |  |  | $ | — |  |  | $ | 16,016 |  |  | $ | 2,889 |  |  | $ | 16,016 |  |  | $ | 2,889 |
Corporate bonds and direct obligations of government agencies |  |  | 54,031 |  |  |  | 1,516 |  |  |  | 62,390 |  |  |  | 6,259 |  |  |  | 116,421 |  |  |  | 7,775 |
U.S. Treasury obligations |  |  | 2,244 |  |  |  | 100 |  |  |  | — |  |  |  | — |  |  |  | 2,244 |  |  |  | 100 |
Total |  | $ | 56,275 |  |  | $ | 1,616 |  |  | $ | 78,406 |  |  | $ | 9,148 |  |  | $ | 134,681 |  |  | $ | 10,764 |
December 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  | $ | 22,095 |  |  | $ | 346 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,095 |  |  | $ | 346 |
Corporate bonds and direct obligations of government agencies |  |  | 72,526 |  |  |  | 966 |  |  |  | — |  |  |  | — |  |  |  | 72,526 |  |  |  | 966 |
Total |  | $ | 94,621 |  |  | $ | 1,312 |  |  | $ | — |  |  | $ | — |  |  | $ | 94,621 |  |  | $ | 1,312 |
The Company believes unrealized losses on investments were primarily caused by rising interest rates rather than changes in credit quality. The Company expects to recover, through collection of all of the contractual cash flows of each security, the amortized cost basis of these securities as it does not intend to sell, and does not anticipate being required to sell, these securities before recovery of the cost basis. For these reasons, no losses have been recognized in the Company’s consolidated statements of income. Short-term investments include $53,955,000 in current maturities of investments held by the Company’s insurance segment at December 31, 2022. The non-current portion of the bond portfolio of $104,575,000 is included in other assets. The short-term investments, together with $31,119,000 of non-current investments, provide collateral for the $76,567,000 of letters of credit issued to guarantee payment of insurance claims. Investment income represents the earnings on the insurance segment’s assets. Investment income earned from the assets of the insurance segment are included as a component of operating income as the investment of these assets is critical to providing collateral, liquidity and earnings with respect to the operation of the Company’s insurance programs.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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