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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule Of Marketable Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(amounts in thousands) | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2022 |  | Cost |  | Holding Gains |  | Holding Losses |  | Value
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Level 1 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 5,185
Level 2 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate and municipal bonds | ​ | $ | 190,025 | ​ | $ | 2,110 | ​ | $ | (10,901) | ​ | ​ | 181,234
Total | ​ | $ | 190,025 | ​ | $ | 2,110 | ​ | $ | (10,901) | ​ | $ | 186,419
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(amounts in thousands) | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 25, 2021 |  | Cost |  | Holding Gains |  | Holding Losses |  | Value
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Level 1 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 6,509
Level 2 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate and municipal bonds | ​ | $ | 151,947 | ​ | $ | 4,753 | ​ | $ | (2,384) | ​ | ​ | 154,315
Commercial paper | ​ | ​ | 44,931 | ​ | ​ | 2 | ​ | ​ | (13) | ​ | ​ | 44,920
Total | ​ | $ | 196,878 | ​ | $ | 4,755 | ​ | $ | (2,397) | ​ | $ | 205,744
​
Schedule Of Maturities Of Marketable Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
(amounts in thousands) |  | Cost |  | Value
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 50,645 | ​ | $ | 48,635
Due after one year through five years | ​ | ​ | 86,011 | ​ | ​ | 82,959
Due after five years through ten years | ​ | ​ | 29,923 | ​ | ​ | 26,843
Due after ten years | ​ | ​ | 23,446 | ​ | ​ | 22,797
Total | ​ | $ | 190,025 | ​ | $ | 181,234
​

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