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Earnings Per Share - Earnings Allocable to Common Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic earnings per share:
Net income (loss) allocable to common shareholders for basic earnings per common share	$ (7,343)	$ (18,984)	$ 337,807	$ 50,698
Numerator for diluted earnings per share:
Net income (loss) allocable to common shareholders	$ (7,343)	$ (18,984)	$ 344,557	$ 57,448
Denominator for basic and diluted earnings per share:
Weighted average common shares outstanding for basic earnings per common share (in shares)	62,168	67,975	64,624	67,940
Add: Effect of assumed shares issued under treasury stock method for restricted stock units (in shares)	0	0	114	131
Add: Effect of series J convertible perpetual preferred stock (in shares)	0	0	16,138	15,658
Weighted average common shares outstanding for diluted earnings per common share (in shares)	62,168	67,975	80,876	83,729
Basic earnings per common share:
Net income (loss) allocable to common shareholders (in dollars per share)	$ (0.12)	$ (0.28)	$ 5.23	$ 0.75
Diluted earnings per common share:
Net income (loss) allocable to common shareholders (in dollars per share)	$ (0.12)	$ (0.28)	$ 4.26	$ 0.69

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