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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Assets Measured at Fair Value On a Recurring Basis
Financial instruments measured at fair value on a recurring basis:
September 30, 2020December 31, 2019
(in thousands)TotalLevel 1Level 2TotalLevel 1Level 2
Cash equivalents   
Money market funds$80,121 $80,121 $— $42,653 $42,653 $— 
Commercial paper22,783 — 22,783 5,807 — 5,807 
Municipal debt securities10,205 — 10,205 1,202 — 1,202 
Federal agency debt securities1,340 — 1,340 — — — 
Total cash equivalents114,449 80,121 34,328 49,662 42,653 7,009 
Short-term     
Commercial paper212,992 — 212,992 161,286 — 161,286 
Corporate debt securities139,659 — 139,659 145,975 — 145,975 
Municipal debt securities52,437 — 52,437 12,237 — 12,237 
Federal agency debt securities35,389 — 35,389 13,515 — 13,515 
US Treasury bonds1,287 — 1,287 2,915 — 2,915 
Total short-term441,764 — 441,764 335,928 — 335,928 
Long-term      
Corporate debt securities— — — 15,396 — 15,396 
US Treasury bonds— — — 146 — 146 
Total long-term— — — 15,542 — 15,542 
Total financial instruments$556,213 $80,121 $476,092 $401,132 $42,653 $358,479 
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:
September 30, 2020December 31, 2019
(in thousands)Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair ValueHierarchy Level
Non-publicly held debt$1,461,705 $1,349,111 $1,329,882 $1,140,232 3