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Investments (Tables)
 12 Months Ended
Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of unrestricted marketable securities Unrestricted available-for-sale marketable securities held by the Company are as follows (dollars in thousands):
December 31,
2022		December 31, 2021
Corporate, U.S. government agency and municipal debt securities
Amortized cost$466,333 $253,301 
Gross unrealized gains14 2,349 
Gross unrealized losses(4,237)(238)
Total fair value$462,110 $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):
 December 31,
2022
Less than 1 year$368,214 
1 year to 2 years77,584 
2 years to 3 years16,312 
3 years to 4 years— 
Greater than 4 years— 
Total$462,110