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Fair Values of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Estimated Fair Value of Outstanding Debt Balances | The estimated fair value of our outstanding debt balances as of June 30, 2021 and December 31, 2020 is set forth below (in thousands):
| June 30, 2021 |  |  | December 31, 2020 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
Term Loan Agreement | $ | 50,000 |  |  | $ | 50,000 |  |  | $ | 50,000 |  |  | $ | 50,000 |
3.95% Senior Notes |  | 509,505 |  |  |  | 516,397 |  |  |  | 509,505 |  |  |  | 471,019 |
5.15% Senior Notes |  | 349,250 |  |  |  | 366,655 |  |  |  | 349,250 |  |  |  | 319,560 |
Total debt | $ | 908,755 |  |  | $ | 933,052 |  |  | $ | 908,755 |  |  | $ | 840,579 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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