CONSOLIDATED STATEMENTS OF COMPRHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Consolidated net income attributable to common stockholders	$ 9,313	$ 5,280	$ 26,695	$ 11,922
Other comprehensive income:
Net unrealized income/(loss) on investments in available-for-sale debt securities	1,767	4,337	3,043	(876)
Income tax expense related to items of other comprehensive income	0	0	0	0
Comprehensive income	$ 11,080	$ 9,617	$ 29,738	$ 11,046