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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2023
Derivative Instrument Detail [Abstract] |
Estimated Fair Value of Financial Instruments | Carrying amounts and estimated fair values of our financial instruments as of December 31 are as follows:
|  | 2023 |  |  | 2022 |
(in thousands) |  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Derivative assets related to interest rate swaps (Level 2) |  | $ | 129,125 |  |  | $ | 129,125 |  |  | $ | 144,583 |  |  | $ | 144,583 |
Long-term debt, including current portion (Level 2): |  |  |  |  |  |  |  |  |  |  |  |
Term loans |  | $ | (969,919 | ) |  | $ | (965,718 | ) |  | $ | (969,269 | ) |  | $ | (961,632 | )
Revenue bonds |  |  | (65,735 | ) |  |  | (64,786 | ) |  |  | (65,735 | ) |  |  | (64,602 | )
Total long-term debt 1 |  | $ | (1,035,654 | ) |  | $ | (1,030,504 | ) |  | $ | (1,035,004 | ) |  | $ | (1,026,234 | )
Company owned life insurance (Level 3) |  | $ | 5,220 |  |  | $ | 5,220 |  |  | $ | 4,311 |  |  | $ | 4,311 |
1 | The carrying amount of long-term debt includes principal and unamortized discounts.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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