Investments (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2022		December 31, 2021
	(unaudited)
Corporate and U.S. government agency and municipal debt securities
Amortized cost	$	322,797	$	253,301
Gross unrealized gains	497		2,349
Gross unrealized losses	(1,472)		(238)
Total fair value	$	321,822	$	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):

	March 31, 2022
	(unaudited)
Less than 1 year	$	196,485
1 year to 2 years	111,584
2 years to 3 years	13,753
3 years to 4 years	—
Greater than 4 years	—
Total	$	321,822