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Investments (Tables)
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of unrestricted available-for-sale marketable securities Unrestricted available-for-sale marketable securities held by the Company are as follows (dollars in thousands):
September 30,
2022		December 31,
2021
(unaudited)
Corporate and U.S. government agency and municipal debt securities
Amortized cost$417,576 $253,301 
Gross unrealized gains— 2,349 
Gross unrealized losses(5,342)(238)
Total fair value$412,234 $255,412 
Schedule of contractual maturities of the unrestricted available-for-sale marketable securities held The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands):
September 30,
2022
(unaudited)
Less than 1 year$280,297 
1 year to 2 years104,346 
2 years to 3 years27,591 
3 years to 4 years— 
Greater than 4 years— 
Total$412,234