EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic Earnings/(Loss) per Share:
Net income/(loss) to common stockholders	$ 85,522	$ (908,995)
Dividends declared on preferred stock	(8,219)	(5,215)
Dividends, dividend equivalents and undistributed earnings allocated to participating securities	(274)	0
Net income/(loss) to common stockholders - basic	$ 77,029	$ (914,210)
Basic weighted average common shares outstanding (in shares)	451,135	452,979
Basic (Loss)/Earnings per Share (usd per share)	$ 0.17	$ (2.02)
Diluted Earnings/(Loss) per Share:
Net income/(loss) to common stockholders - basic	$ 77,029	$ (914,210)
Interest expense on Convertible Senior Notes	3,909	0
Net income/(loss) to common stockholders - diluted	$ 80,938	$ (914,210)
Basic weighted average common shares outstanding (in shares)	451,135	452,979
Effect of assumed Convertible Senior Notes conversion to common shares (in shares)	28,920	0
Diluted weighted average common shares outstanding (in shares)	480,055	452,979
Diluted EPS (usd per share)	$ 0.17	$ (2.02)
Anti-dilutive securities excluded from diluted earnings per share calculations (in shares)	3,100
RSUs
Diluted Earnings/(Loss) per Share:
Weighted average grant date fair value (in dollars per share)	$ 4.87