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Fair Values of Financial Instruments | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Fair Values of Financial Instruments | 15. Fair Values of Financial Instruments The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair value due to the short-term maturity of these items. These fair value estimates are considered Level 1 fair value estimates in the fair value hierarchy of fair value accounting. 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 |
The fair values of the 3.95% Senior Notes at June 30, 2021 and December 31, 2020 are based on discounted cash flows associated with the notes using the 3.72% market rate of interest at June 30, 2021 and the 5.24% market rate of interest at December 31, 2020. The fair values of the 5.15% Senior Notes at June 30, 2021 and December 31, 2020 are based on discounted cash flows associated with the notes using the 4.43% market rate of interest at June 30, 2021 and the 6.42% market rate of interest at December 31, 2020. The fair value estimates of the 3.95% Senior Notes and the 5.15% Senior Notes are considered Level 1 fair value estimates in the fair value hierarchy of fair value accounting. The carrying values of the balance outstanding at June 30, 2021 under the Term Loan Agreement approximated its fair value as the instrument has a floating interest rate.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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