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Earnings per Common Share - Summary of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings per common share—basic
Net income (loss)	$ (15,991)	$ 52,432	$ 348,214	$ (86,358)
Weighted-average common shares outstanding—basic (in shares)	185,963	94,171	163,141	94,207
Basic (loss) earnings per common share (in dollars per share)	$ (0.09)	$ 0.56	$ 2.13	$ (0.92)
Earnings per common share—diluted
Net income (loss)	$ (15,991)	$ 52,432	$ 348,214	$ (86,358)
Weighted-average common shares outstanding—basic (in shares)	185,963	94,171	163,141	94,207
Convertible notes weighted-average shares outstanding (in shares)	0	924	6,117	0
Options and restricted stock and performance share units (in shares)	0	1,517	1,936	0
Weighted-average common shares outstanding—diluted (in shares)	185,963	96,612	171,194	94,207
Dilutive earnings (loss) per common share (in dollars per share)	$ (0.09)	$ 0.54	$ 2.03	$ (0.92)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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