CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
General and administrative expense	$ 14,573	$ 9,877	$ 39,485	$ 27,948
Rental income	246	66	738	66
Interest income (expense)	(308)	(847)	(1,158)	(4,858)
VIE, Primary Beneficiary
General and administrative expense	700	800	2,000	1,400
Rental income	200	0	700	0
Interest income (expense)	$ 300	$ 300	$ 300	$ 2,900