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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value On a Recurring Basis
Financial instruments measured at fair value on a recurring basis:
As of June 30, 2023As of December 31, 2022
(in thousands)TotalLevel 1Level 2TotalLevel 1Level 2
Cash equivalents   
Money market funds$34,211 $34,211 $— $88,073 $88,073 $— 
Commercial paper25,946 — 25,946 50,791 — 50,791 
Municipal debt securities7,998 — 7,998 8,599 — 8,599 
Federal agency debt securities2,296 — 2,296 — — — 
Total cash equivalents70,451 34,211 36,240 147,463 88,073 59,390 
Short-term     
Commercial paper367,982 — 367,982 421,279 — 421,279 
Federal agency debt securities219,032 — 219,032 107,222 — 107,222 
Corporate debt securities189,954 — 189,954 166,136 — 166,136 
US Treasury Bonds30,713 — 30,713 — — — 
Municipal debt securities17,486 — 17,486 30,426 — 30,426 
Total short-term825,167 — 825,167 725,063 — 725,063 
Long-term      
Federal agency debt securities32,921 — 32,921 20,050 — 20,050 
Corporate debt securities22,915 — 22,915 35,688 — 35,688 
Municipal debt securities13,460 — 13,460 7,580 — 7,580 
Total long-term69,296 — 69,296 63,318 — 63,318 
Total financial instruments$964,914 $34,211 $930,703 $935,844 $88,073 $847,771 
Fair Value, Liabilities Measured on Recurring Basis
Carrying value and estimated fair value of long-term debt, excluding finance leases, including current maturities and without reduction for related costs, are as follows:
As of June 30, 2023As of December 31, 2022
(in thousands)Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair ValueHierarchy Level
Fair Value of Notes Payable$1,711,807 $1,719,626 $1,626,114 $1,561,939 3