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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2025
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 September 30, 2025As of December 31, 2024
(in thousands)TotalLevel 1Level 2TotalLevel 1Level 2
Cash equivalents   
Commercial paper$85,176 $— $85,176 $22,689 $— $22,689 
Money market funds48,309 48,309 — 41,494 41,494 — 
Municipal debt securities12,189 — 12,189 10,299 — 10,299 
US Government and agency obligations12,127 — 12,127 81,535 — 81,535 
Corporate debt securities3,013 — 3,013 4,133 — 4,133 
Total cash equivalents160,814 48,309 112,505 160,150 41,494 118,656 
Short-term     
Corporate debt securities281,717 — 281,717 242,313 — 242,313 
Commercial paper253,068 — 253,068 149,807 — 149,807 
US Government and agency obligations65,752 — 65,752 94,295 — 94,295 
Certificates of deposit27,839 — 27,839 7,239 — 7,239 
Municipal debt securities12,119 — 12,119 1,580 — 1,580 
Total short-term640,495 — 640,495 495,234 — 495,234 
Long-term      
Corporate debt securities15,076 — 15,076 39,931 — 39,931 
US Government and agency obligations14,355 — 14,355 10,452 — 10,452 
Municipal debt securities5,109 — 5,109 1,342 — 1,342 
Total long-term34,540 — 34,540 51,725 — 51,725 
Total financial instruments$835,849 $48,309 $787,540 $707,109 $41,494 $665,615 
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:
As of September 30, 2025As of December 31, 2024
(in thousands)Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair ValueFair Value Level
Non-publicly held debt$1,665,446 $1,658,344 $1,653,737 $1,667,275 3