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Fair Value
9 Months Ended
Sep. 26, 2020
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
Accounting principles generally accepted in the U.S. define fair value as the price that would be received to sell an asset or transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. The authoritative guidance discusses valuation techniques, such as the market approach (comparable market prices), the income approach (present value of future income or cash flow), and the cost approach (cost to replace the service capacity of an asset or replacement cost). These valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. As the basis for evaluating such inputs, a three-tier value hierarchy prioritizes the inputs used in measuring fair value as follows:

Level 1: Observable inputs such as quoted prices for identical assets or liabilities in active markets.

Level 2: Observable inputs other than quoted prices that are directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets; quoted prices for similar or identical assets or liabilities in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions.

For publicly-traded investment securities, including the Company’s money market and short-duration bond funds, 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 September 26, 2020 and December 31, 2019:

 Fair Value
September 26, 2020December 31, 2019
Cash and cash equivalents:
Money market funds (Level 1)$310,569 — 
Short-term investments:
Short-duration bond fund (Level 1) (1)
407,784 — 
Commercial paper (Level 2)— 42,500 
(1) The Company's investment is in a Short-duration bond fund that is designed to deliver current income consistent with the preservation of capital through investing in high-and medium grade fixed income securities. The investment is readily convertible into cash.
The fair values and carrying values of the Company's debt are disclosed in Note 19 - Debt.