Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 22,743	$ 19,174	$ 67,756	$ 48,672
Other comprehensive income (loss):
Changes in net unrealized gains (losses), net of tax effects of $183 and ($6) in the three months ended September 30, 2020 and 2019, respectively, and ($245) and ($257) in the nine months ended September 30, 2020 and 2019, respectively.	(619)	40	825	1,419
Reclassification adjustments for net realized (gains) losses included in net income, net of tax effects of ($32) and $0 in the three months ended September 30, 2020 and 2019, respectively, and ($2) and ($6) in the nine months ended September 30, 2020 and 2019, respectively.	108	(18)	8	25
Total changes in unrealized gains (losses) on marketable securities, net of tax	(511)	22	833	1,444
Changes in net unrealized gains (losses), net of tax effects of $213 and ($313) in the three months ended September 30, 2020 and 2019, respectively, and $152 and ($404) in the nine months ended September 30, 2020 and 2019, respectively.	(718)	1,072	(510)	1,423
Reclassification adjustments for net realized (gains) losses included in net income, net of tax effects of $39 and $16 in the three months ended September 30, 2020 and 2019, respectively, and $121 and $0 in the nine months ended September 30, 2020 and 2019, respectively.	(131)	(63)	(410)	(10)
Total changes in unrealized gains (losses) on cash flow hedges, net of tax	(849)	1,009	(920)	1,413
Other comprehensive income (loss), net of tax	(1,360)	1,031	(87)	2,857
Comprehensive income	$ 21,383	$ 20,205	$ 67,669	$ 51,529