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Investments
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Marketable Securities
Unrestricted available-for-sale marketable securities held by the Company are as follows (dollars in thousands):
September 30, 2024December 31, 2023
(unaudited)
Corporate, U.S. government agency and municipal debt securities
Amortized cost$371,381 $197,153 
Gross unrealized gains263 5 
Gross unrealized losses(107)(721)
Total fair value$371,537 $196,437 
As of September 30, 2024, all of our unrestricted available-for-sale marketable securities have contractual maturities of one year or less.
As of September 30, 2024, there was no impairment due to credit loss on any available-for-sale marketable securities.