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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021December 31, 2020
(in thousands)TotalLevel 1Level 2TotalLevel 1Level 2
Cash equivalents   
Money market funds$100,965 $100,965 $— $5,340 $5,340 $— 
Commercial Paper25,199 — 25,199 48,908 — 48,908 
Municipal debt securities16,674 — 16,674 34,338 — 34,338 
Federal agency debt securities— — — 51,400 — 51,400 
Total cash equivalents142,838 100,965 41,873 139,986 5,340 134,646 
Short-term     
Commercial paper387,044 — 387,044 229,821 — 229,821 
Corporate debt securities267,821 — 267,821 166,768 — 166,768 
Municipal debt securities219,479 — 219,479 87,290 — 87,290 
Federal agency debt securities3,000 — 3,000 48,598 — 48,598 
Total short-term877,344 — 877,344 532,477 — 532,477 
Total financial instruments$1,020,182 $100,965 $919,217 $672,463 $5,340 $667,123 
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, 2021December 31, 2020
(in thousands)Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair ValueHierarchy Level
Non-publicly held debt$1,329,907 $1,157,257 $1,555,637 $1,191,008 3