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Fair Values of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Fair Value Disclosures [Abstract] |
Estimated Fair Value of Outstanding Debt Balances | The estimated fair value of our outstanding debt balances as of September 30, 2020 and December 31, 2019 is set forth below (in thousands):
| September 30, 2020 |  |  | December 31, 2019 |
| Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
| Value |  |  | Value |  |  | Value |  |  | Value |
3.95% Senior Notes | $ | 525,000 |  |  | $ | 404,665 |  |  | $ | 525,000 |  |  | $ | 511,485 |
5.15% Senior Notes |  | 350,000 |  |  |  | 268,820 |  |  |  | 350,000 |  |  |  | 358,864 |
2019 Term Loan |  | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 |
Total debt | $ | 975,000 |  |  | $ | 773,485 |  |  | $ | 975,000 |  |  | $ | 970,349 |

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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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