CONSOLIDATED STATEMENTS OF COMPRHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income attributable to common stockholders	$ 400	$ 7,330
Other comprehensive (loss)/income:
Net unrealized (loss)/gain on investments in available-for-sale debt securities	(28,444)	397
Income tax expense related to items of other comprehensive income	0	0
Comprehensive (loss)/income	$ (28,044)	$ 7,727