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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Assets he Company recognized the following assets at fair value on a recurring basis in the consolidated balance sheets:
 Fair Value Measurements at Reporting Date Using
(in thousands)TotalLevel 1Level 2Level 3
As of March 31, 2024
Equity securities$109,861 $109,861 $— $— 
Mutual funds(1)
40,413 40,413 — — 
Money market funds(1)
4,653 — 4,653 — 
Total$154,927 $150,274 $4,653 $— 
As of December 31, 2023
Equity securities$116,374 $116,374 $— $— 
Mutual funds(1)
36,810 36,810 — — 
Money market funds(1)
4,767 — 4,767 — 
Total$157,951 $153,184 $4,767 $— 
(1) The current assets at fair value noted above are presented in prepaid expenses and other current assets in the consolidated balance sheets. The long-term assets at fair value noted above are presented in investments for employee benefit plans, at fair value in the consolidated balance sheets.
Schedule of Investments in Equity Securities
The following table is a summary of the unrealized gains and losses of the investments in equity securities:
As of March 31, 2024As of December 31, 2023
(in thousands)CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueCostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Equity securities$111,190 $— $(1,329)$109,861 $112,420 $3,954 $— $116,374 
Schedule of Carrying Amounts and Fair Values As of March 31, 2024 and December 31, 2023, the carrying amounts and the fair values were as follows:
March 31, 2024December 31, 2023
(in thousands)Carrying AmountFair ValueCarrying AmountFair Value
2020 Senior Notes$445,842 $395,127 $445,690 $389,241 
2019 Senior Notes$396,590 $358,660 $396,440 $355,068