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Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The Company estimates the fair value of its financial instruments utilizing a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The following summarizes the three levels of inputs, as well as the assets that the Company values using those levels of inputs on a recurring basis.
Level 1: Quoted prices in active markets for identical assets and liabilities. The Company’s Level 1 assets consist of marketable securities (primarily mutual funds) held in the Deferred Compensation Plan.
Level 2: Observable inputs, other than quoted prices in active markets for identical assets and liabilities, such as quoted prices for similar assets and liabilities; quoted prices in markets that are not active; or other inputs that are observable. The Company’s Level 2 assets consist of money market funds held in the Company's Deferred Compensation Plan.
Level 3: Unobservable inputs, supported by little or no market data available, where the reporting entity is required to develop its own assumptions to determine the fair value of the instrument. The Company does not currently have any assets recorded at fair value whose fair value was determined using Level 3 inputs and there were no transfers of Level 3 assets during the three months ended March 31, 2021.
As of March 31, 2021 and December 31, 2020, the Company had the following assets recorded in the consolidated balance sheets measured at fair value on a recurring basis:
 Fair Value Measurements at Reporting Date Using
(in thousands)TotalLevel 1Level 2Level 3
As of March 31, 2021
Mutual funds (1)
$28,880 $28,880 $ $ 
Money market funds (1)
2,485  2,485  
Total$31,365 $28,880 $2,485 $ 
As of December 31, 2020
Mutual funds (1)
$28,520 $28,520 $— $— 
Money market funds (1)
2,836 — 2,836 — 
Total$31,356 $28,520 $2,836 $— 
(1) Included in Investments, employee benefit plans, at fair value and Other current assets on the consolidated balance sheets.
Other financial instruments disclosure
The Company believes that the fair values of its current assets and current liabilities approximate their reported carrying amounts due to the short-term nature of these items. In addition, the interest rates of the Company's senior unsecured revolving credit facility adjust frequently based on current market rates; accordingly we believe its carrying amount, when amounts are drawn, approximates fair value.
The fair values of the Company's $400 million 2012 Senior Notes, $400 million 2019 Senior Notes, and $450 million 2020 Senior Notes are classified as Level 2, as the significant inputs are observable in an active market. At March 31, 2021 and December 31, 2020, the $216.6 million remaining 2012 Senior Notes had an approximate fair value of $228.8 million and $232.4 million. At March 31, 2021 and December 31, 2020, the $400 million 2019 Senior Notes had an approximate fair value of $418.9 million and $438.1 million, respectively, and the $450 million 2020 Senior Notes had an approximate fair value of $471.9 million and $498.3 million, respectively. Refer to Note 5 for further information on debt.
Fair value estimates are made at a specific point in time, are subjective in nature and involve uncertainties and matters of significant judgment. Settlement of such fair value amounts may not be possible or a prudent management decision.