Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Residential mortgage loans, held-for-sale, fair value	$ 2,824,909	$ 4,613,612
Notes and bonds payable, fair value	$ 258,806	$ 659,738
Preferred stock, par values (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	415,744,518	415,520,780
Common stock, shares outstanding (in shares)	415,744,518	415,520,780
7.50% Series A Preferred Stock
Interest rate	7.50%	7.50%
Preferred stock, par values (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	11,500,000	11,500,000
Preferred stock, shares issued (in shares)	6,210,000	6,210,000
Preferred stock, shares outstanding (in shares)	6,210,000	6,210,000
7.125% Series B Preferred Stock
Interest rate	7.125%	7.125%
Preferred stock, par values (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	11,500,000	11,500,000
Preferred stock, shares issued (in shares)	11,300,000	11,300,000
Preferred stock, shares outstanding (in shares)	11,300,000	11,300,000
6.375% Series C Preferred Stock
Interest rate	6.375%	6.375%
Preferred stock, par values (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	16,100,000	16,100,000
Preferred stock, shares issued (in shares)	16,100,000	16,100,000
Preferred stock, shares outstanding (in shares)	0	0