CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)	$ 805,582	$ (1,357,684)	$ 605,933
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on available-for-sale securities, net	29,944	123,855	445,943
Reclassification of net realized (gain) loss on available-for-sale securities, net into net income	(5,388)	(740,309)	(180,815)
Comprehensive income (loss)	830,138	(1,974,138)	871,061
Comprehensive income (loss) attributable to noncontrolling interests	33,356	52,674	42,637
Dividends on preferred stock	66,744	54,295	13,281
Comprehensive income (loss) attributable to common stockholders	$ 730,038	$ (2,081,107)	$ 815,143