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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Contractual Maturities of Debt Securities
The following table summarizes the contractual maturities of debt securities held at June 30, 2024 and December 31, 2023, which are classified as “Marketable securities, at fair value” and “Restricted marketable securities, at fair value” in the Consolidated Balance Sheets:

Debt Securities — Available-for-Sale
Contractual maturity:June 30, 2024December 31, 2023
(in thousands)
Marketable securities, at fair value
Maturing in one year or less$1,007 $6,324 
Maturing in second year through fifth year27,296 34,939 
Maturing in sixth year through tenth year32,934 39,309 
Maturing after ten years17,897 12,559 
Total marketable securities, at fair value$79,134 $93,131 
Restricted marketable securities, at fair value
Maturing in one year or less$1,047 $— 
Maturing in second year through fifth year7,058 — 
Maturing in sixth year through tenth year12,895 — 
Maturing after ten years1,022 — 
Total restricted marketable securities, at fair value$22,022 $— 
Total debt securities — available-for-sale$101,156 $93,131 
Schedule of Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Value of Debt Securities
The following table shows the amortized cost, unrealized gains and losses, and estimated fair value of the Company’s debt securities as of June 30, 2024 and December 31, 2023:

Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Credit Impairment Losses1
(in thousands)
June 30, 2024
Type of security:
Marketable securities
Municipal bonds — taxable$9,242 $18 $(752)$8,508 $— 
Municipal bonds — non-taxable73,216 49 (2,639)70,626 — 
Total marketable securities$82,458 $67 $(3,391)$79,134 $— 
Restricted marketable securities
U.S. treasury bonds$6,888 $13 $— $6,901 $— 
U.S. government agency bonds1,207 2 — 1,209 — 
International fixed income bonds625 — (1)624 — 
Corporate bonds5,134 5 (2)5,137 — 
Municipal bonds — taxable8,156 16 (21)8,151 — 
Total restricted marketable securities$22,010 $36 $(24)$22,022 $— 
Total debt securities — available-for-sale$104,468 $103 $(3,415)$101,156 $— 
December 31, 2023
Type of security:
Municipal bonds — non-taxable$95,466 $387 $(2,722)$93,131 $— 
Total debt securities — available-for-sale$95,466 $387 $(2,722)$93,131 $— 
1.The Company performs a credit impairment loss assessment quarterly on an individual security basis. As of June 30, 2024 and December 31, 2023, no allowance for credit loss has been recognized as the issuers of these securities have not established a cause for default and various rating agencies have reaffirmed each security’s investment grade status. The fair value of these securities have fluctuated since the purchase date as market interest rates fluctuate. The Company does not intend to sell these securities and it is more likely than not that the Company will not be required to sell before the recovery of the securities’ amortized cost basis.
Schedule of Fair Value Measurements Information for Marketable Securities and Deferred Compensation Fund Investments
The following tables provide fair value measurement information for the Company’s financial assets, including marketable securities, restricted marketable securities and deferred compensation fund investments as of June 30, 2024 and December 31, 2023:

As of June 30, 2024
Fair Value Measurement Using:
Carrying AmountTotal Fair ValueQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
(in thousands)
Marketable securities
Municipal bonds — taxable$8,508 $8,508 $— $8,508 $— 
Municipal bonds — non-taxable70,626 70,626 — 70,626 — 
Total marketable securities$79,134 $79,134 $— $79,134 $— 
Restricted marketable securities
U.S. treasury bonds$6,901 $6,901 $— $6,901 $— 
U.S. government agency bonds1,209 1,209 — 1,209 — 
International fixed income bonds624 624 — 624 — 
Corporate bonds5,137 5,137 — 5,137 — 
Municipal bonds — taxable8,151 8,151 — 8,151 — 
Total restricted marketable securities$22,022 $22,022 $— $22,022 $— 
Deferred compensation fund
Money market1
$1,933 $1,933 $— $1,933 $— 
Commodities315 315 315 — — 
Fixed income4,605 4,605 4,605 — — 
International4,942 4,942 4,942 — — 
Large cap blend5,794 5,794 5,794 — — 
Large cap growth16,890 16,890 16,890 — — 
Large cap value6,543 6,543 6,543 — — 
Mid cap blend3,382 3,382 3,382 — — 
Real estate350 350 350 — — 
Small cap blend2,679 2,679 2,679 — — 
Total deferred compensation fund2
$47,433 $47,433 $45,500 $1,933 $— 
As of December 31, 2023
Fair Value Measurement Using:
Carrying
Amount		Total Fair
Value		Quoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
(in thousands)
Marketable securities
Municipal bonds — non-taxable$93,131 $93,131 $— $93,131 $— 
Deferred compensation fund
Money market1
$2,007 $2,007 $— $2,007 $— 
Commodities298 298 298 — — 
Fixed income4,254 4,254 4,254 — — 
International4,621 4,621 4,621 — — 
Large cap blend5,053 5,053 5,053 — — 
Large cap growth13,886 13,886 13,886 — — 
Large cap value5,964 5,964 5,964 — — 
Mid cap blend3,192 3,192 3,192 — — 
Real estate374 374 374 — — 
Small cap blend2,664 2,664 2,664 — — 
Deferred compensation fund2
$42,313 $42,313 $40,306 $2,007 $— 
1.The fair value of the money market fund is based on the NAV of the shares held by the plan at the end of the period. The money market fund includes short-term United States dollar denominated money market instruments and the NAV is determined by the custodian of the fund. The money market fund can be redeemed at its NAV at the measurement date as there are no significant restrictions on the ability to sell this investment.
2.As of June 30, 2024 and December 31, 2023, $1.4 million and $1.5 million of short-term deferred compensation funding is included within “Prepaid expenses and other assets” in the Company’s Consolidated Balance Sheets, respectively. Such amounts of short-term deferred compensation funding represent investments expected to be liquidated and paid within 12 months of June 30, 2024 and December 31, 2023, respectively.