EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic Earnings/(Loss) per Share:
Net income/(loss) to common stockholders	$ 132,511	$ 66,714	$ 85,522	$ 87,210	$ 96,578	$ (908,995)	$ 284,747	$ (725,207)
Dividends declared on preferred stock	(8,218)			(8,219)			(24,656)	(21,578)
Dividends, dividend equivalents and undistributed earnings allocated to participating securities	(435)			(325)			(915)	(91)
Net income/(loss) to common stockholders - basic	$ 123,858			$ 78,666			$ 259,176	$ (746,876)
Basic weighted average common shares outstanding (in shares)	440,889			453,323			444,481	453,170
Basic (Loss)/Earnings per Share (usd per share)	$ 0.28			$ 0.17			$ 0.58	$ (1.65)
Diluted Earnings/(Loss) per Share:
Net income/(loss) to common stockholders - basic	$ 123,858			$ 78,666			$ 259,176	$ (746,876)
Interest expense on Convertible Senior Notes	3,920			3,898			11,743	0
Dividends, dividend equivalents and undistributed earnings allocated to participating securities	435			0			915	0
Net income/(loss) to common stockholders - diluted	$ 128,213			$ 82,564			$ 271,834	$ (746,876)
Basic weighted average common shares outstanding (in shares)	440,889			453,323			444,481	453,170
Effect of assumed Convertible Senior Notes conversion to common shares (in shares)	28,920			28,920			28,920	0
Unvested and vested restricted stock units (in shares)	3,377			0			1,623	0
Effect of Warrants (in shares)	0			11,297			0	0
Diluted weighted average common shares outstanding (in shares)	473,186			493,540			475,024	453,170
Diluted EPS (usd per share)	$ 0.27			$ 0.17			$ 0.57	$ (1.65)
Anti-dilutive securities excluded from diluted earnings per share calculations (in shares)							7,000
RSUs
Diluted Earnings/(Loss) per Share:
Weighted average grant date fair value (in dollars per share)	$ 4.21						$ 4.21