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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value On a Recurring Basis
Financial instruments measured at fair value on a recurring basis:
March 31, 2022December 31, 2021
(in thousands)TotalLevel 1Level 2TotalLevel 1Level 2
Cash equivalents   
Money market funds$4,295 $4,295 $— $25,019 $25,019 $— 
Commercial Paper144,882 — 144,882 179,455 — 179,455 
Municipal debt securities48,066 — 48,066 63,875 — 63,875 
Corporate debt securities7,849 — 7,849 — — — 
Total cash equivalents205,092 4,295 200,797 268,349 25,019 243,330 
Short-term     
Commercial paper377,695 — 377,695 419,469 — 419,469 
Corporate debt securities255,848 — 255,848 234,436 — 234,436 
Municipal debt securities173,561 — 173,561 165,573 — 165,573 
Federal agency debt securities1,845 — 1,845 — — — 
Total short-term808,949 — 808,949 819,478 — 819,478 
Long-term      
Municipal debt securities— — — 2,231 — 2,231 
Total long-term— — — 2,231 — 2,231 
Total financial instruments$1,014,041 $4,295 $1,009,746 $1,090,058 $25,019 $1,065,039 
Fair Value, Liabilities Measured on Recurring Basis
Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs, are as follows:
March 31, 2022December 31, 2021
(in thousands)Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair ValueHierarchy Level
Non-publicly held debt$1,413,414 $1,198,418 $1,447,462 $1,261,170 3