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Fair Values of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Estimated Fair Value of Outstanding Debt Balances | The estimated fair value of our outstanding debt balances as of September 30, 2023 and December 31, 2022 is set forth below (in thousands):
| September 30, 2023 |  |  | December 31, 2022 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
3.95% Senior Notes Due 2028 | $ | 482,505 |  |  | $ | 433,313 |  |  | $ | 488,505 |  |  | $ | 431,556 |
5.15% Senior Notes Due 2029 |  | 344,895 |  |  |  | 314,329 |  |  |  | 347,900 |  |  |  | 313,164 |
7.15% Senior Notes Due 2033 |  | 400,000 |  |  |  | 414,880 |  |  |  | — |  |  |  | — |
Equipment Loans Due 2025 |  | 21,659 |  |  |  | 21,595 |  |  |  | — |  |  |  | — |
Total debt | $ | 1,249,059 |  |  | $ | 1,184,117 |  |  | $ | 836,405 |  |  | $ | 744,720 |

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- Definition Tabular disclosure of liabilities measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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