CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Equity and debt investments, fair value disclosure	$ 418,830	$ 457,693
Other assets, fair value	26,919	21,386
Accrued and other liabilities, at fair value	$ 95,811	$ 136,861
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 1,033,750	$ 1,033,750
Preferred stock, shares authorized (in shares)	250,000,000	250,000,000
Preferred stock, shares issued (in shares)	41,350,000	41,350,000
Preferred stock, shares outstanding (in shares)	41,350,000	41,350,000
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	949,000,000	949,000,000
Common stock, shares issued (in shares)	480,118,000	487,044,000
Common stock, shares outstanding (in shares)	480,118,000	487,044,000
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	734,000	734,000
Common stock, shares outstanding (in shares)	734,000	734,000