Fair Value Measurements
Investments

The Company measures certain financial assets and liabilities at fair value on a recurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

    Level 1 - Defined as observable inputs such as quoted prices in active markets for identical assets or liabilities

Level 2 - Defined as inputs other than Level 1 inputs that are either directly or indirectly observable

Level 3 - Defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions

The Company uses the market approach valuation technique to determine fair value for investment securities. The assets classified as Level 1 consist of money market funds for which original cost approximates fair value. The assets classified as Level 2 consist of commercial paper, municipal debt securities, federal agency debt securities, U.S. treasury bonds, corporate debt securities and certificates of deposit, which are valued using quoted market prices or alternative pricing sources including transactions involving identical or comparable assets and models utilizing market observable inputs. The Company has no investment securities classified as Level 3.

For those assets classified as Level 2 that are not in active markets, the Company obtains fair value from pricing sources using quoted market prices for identical or comparable instruments, and uses pricing models which include all significant observable inputs: maturity dates, issue dates, settlement dates, benchmark yields, reported trades, broker-dealer quotes, issue spreads, benchmark securities, bids, offers and other market related data. These inputs are observable or can be derived from, or corroborated by, observable market data for substantially the full term of the asset.

Financial instruments measured at fair value on a recurring basis:

As of December 31, 2025As of December 31, 2024
(in thousands)TotalLevel 1Level 2TotalLevel 1Level 2
Cash equivalents   
Money market funds$42,833 $42,833 $— $41,494 $41,494 $— 
US Government and agency obligations16,901 — 16,901 81,535 — 81,535 
Commercial paper14,712 — 14,712 22,689 — 22,689 
Corporate debt securities5,713 — 5,713 4,133 — 4,133 
Municipal debt securities4,520 — 4,520 10,299 — 10,299 
Total cash equivalents84,679 42,833 41,846 160,150 41,494 118,656 
Short-term   
Corporate debt securities337,988 — 337,988 242,313 — 242,313 
Commercial paper179,697 — 179,697 149,807 — 149,807 
US Government and agency obligations67,696 — 67,696 94,295 — 94,295 
Certificates of deposit27,960 — 27,960 7,239 — 7,239 
Municipal debt securities19,618 — 19,618 1,580 — 1,580 
Total short-term632,959 — 632,959 495,234 — 495,234 
Long-term
Corporate debt securities30,127 — 30,127 39,931 — 39,931 
US Government and agency obligations2,696 — 2,696 10,452 — 10,452 
Municipal debt securities— — — 1,342 — 1,342 
Total long-term32,823 — 32,823 51,725 — 51,725 
Total financial instruments$750,461 $42,833 $707,628 $707,109 $41,494 $665,615 

There were no significant transfers between Level 1 and Level 2 assets for the years ended December 31, 2025 and 2024.
Long-term Debt

None of the Company's long-term debt is publicly traded. The Company has determined the estimated fair value of all of this debt to be Level 3, as certain inputs used to determine the fair value of these agreements are unobservable and, therefore, could be sensitive to changes in inputs.The Company utilizes the discounted cash flow method to estimate the fair value of Level 3 debt.

Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs, are as follows:

As of December 31, 2025As of December 31, 2024
(in thousands)Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair ValueFair Value Level
Long-term debt$1,413,205 $1,424,251 $1,653,737 $1,667,275 3

Other

Due to the short term nature, carrying amounts of cash, restricted cash, accounts receivable and accounts payable approximate fair value.

Historical Timeline

Fiscal YearFiled
2025Feb 26, 2026Showing above
2024Mar 3, 2025
2023Feb 29, 2024
2022Feb 27, 2023
2021Mar 1, 2022
2020Mar 1, 2021
2019Feb 27, 2020
2018Feb 28, 2019
2017Mar 1, 2018
2016Feb 24, 2017
2015Feb 22, 2016

About Fair Value Disclosures

Fair value disclosures classify all assets and liabilities measured at fair value into a three-level hierarchy: Level 1 (quoted market prices), Level 2 (observable inputs like yield curves), and Level 3 (unobservable inputs requiring management estimates). The proportion of Level 3 assets directly reflects how much of the balance sheet depends on internal models rather than market evidence.

Key signals: a growing Level 3 balance relative to total fair-value assets increases valuation uncertainty and earnings volatility risk. Watch for transfers between levels — assets moving from Level 2 to Level 3 often signal deteriorating market liquidity. Unrealized gains and losses on Level 3 positions flow through earnings or other comprehensive income, so large swings deserve scrutiny. For financial institutions, examine the sensitivity disclosures that show how Level 3 valuations change under alternative assumptions. Compare the fair value of debt against its carrying amount to gauge hidden leverage.