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Fair Value
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
For publicly-traded investment securities, consisting of the Company’s money market, short-duration bond fund and managed income fund, fair value is determined on the basis of quoted market prices and, accordingly, such investments are classified as Level 1. The Company’s wholly-owned captive insurance company may also invest in the Company’s commercial paper. These short-term commercial paper investments are classified as trading securities and carried at fair value based upon the Level 2 fair value hierarchy.

Items Measured at Fair Value
The following table presents the items measured at fair value as of December 31, 2020 and December 31, 2019:

 Fair Value
December 31, 2020December 31, 2019
Cash and cash equivalents:
Money market fund (Level 1)$197,835 — 
Short-term investments:
Short-term investments (Level 1) (1)
571,741 — 
Commercial paper (Level 2)— 42,500 
(1) The Company's short-term investments are in a short-duration bond fund and a managed income fund that are designed to deliver current income consistent with the preservation of capital through investing in high-and medium grade fixed income securities. The investments are readily convertible into cash.
The fair values and carrying values of the Company’s debt are disclosed in Note 10 - Long-Term Debt.