EPS Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic Earnings/(Loss) per Share:
Net income/(loss) to common stockholders	$ 87,210	$ 96,578	$ (908,995)	$ 95,599	$ 93,040	$ 88,857	$ (725,207)	$ 277,496
Dividends declared on preferred stock	(8,219)			(3,750)	$ (3,750)	$ (3,750)	(21,578)	(11,250)
Dividends, dividend equivalents and undistributed earnings allocated to participating securities	(325)			(280)			(91)	(808)
Net income/(loss) to common stockholders - basic	$ 78,666			$ 91,569			$ (746,876)	$ 265,438
Basic weighted average common shares outstanding (in shares)	453,323			451,020			453,170	450,641
Basic (Loss)/Earnings per Share (usd per share)	$ 0.17			$ 0.20			$ (1.65)	$ 0.59
Diluted Earnings/(Loss) per Share:
Net income/(loss) to common stockholders - basic	$ 78,666			$ 91,569			$ (746,876)	$ 265,438
Interest expense on Convertible Senior Notes	3,898			3,879			0	5,085
Net income/(loss) to common stockholders - diluted	$ 82,564			$ 95,448			$ (746,876)	$ 270,523
Basic weighted average common shares outstanding (in shares)	453,323			451,020			453,170	450,641
Effect of assumed Convertible Senior Notes conversion to common shares (in shares)	28,920			28,920			0	12,712
Effect of Warrants (in shares)	11,297			0			0	0
Diluted weighted average common shares outstanding (in shares)	493,540			479,940			453,170	463,353
Diluted EPS (usd per share)	$ 0.17			$ 0.20			$ (1.65)	$ 0.58
Anti-dilutive securities excluded from diluted earnings per share calculations (in shares)							39,000
RSUs
Diluted Earnings/(Loss) per Share:
Weighted average grant date fair value (in dollars per share)	6.29						$ 6.29
Warrant
Diluted Earnings/(Loss) per Share:
Anti-dilutive securities excluded from diluted earnings per share calculations (in shares)							37,000
Weighted average grant date fair value (in dollars per share)	$ 1.87						$ 1.87