Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 43,789	$ 10,414	$ 69,962	$ 2,018
Other comprehensive income (loss):
Foreign currency translation adjustments	232	(110)	(194)	(77)
Net unrealized holding gains on available-for-sale debt securities (net of tax expense of $536 and $128, and $30 and $358, respectively)	1,696	407	94	1,134
Total other comprehensive income (loss)	1,928	297	(100)	1,057
Comprehensive income	$ 45,717	$ 10,711	$ 69,862	$ 3,075