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Investments (Tables)
 9 Months Ended
Sep. 30, 2021
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,
2021		December 31,
2020
(unaudited)
Amortized cost$628,461 $472,306 
Gross unrealized gains5,878 11,987 
Gross unrealized losses(289)(41)
Total fair value$634,050 $484,252 
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,
2021
(unaudited)
Less than 1 year$228,571 
1 year to 2 years220,770 
2 years to 3 years184,709 
3 years to 4 years— 
Greater than 4 years— 
Total$634,050