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Earnings Per Common Share - Computation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic earnings per common share:
Net income	$ 146,949	$ 24,110
Weighted-average basic common shares	71,009	33,566
Basic earnings per common share (in dollars per share)	$ 2.07	$ 0.72
Diluted earnings per share:
Net income	$ 146,949	$ 24,110
Weighted-average basic common shares	71,009	33,566
Effect of dilutive securities (in shares)	475	239
Weighted-average dilutive shares	71,484	33,805
Diluted earnings per common share (in dollars per share)	$ 2.06	$ 0.71

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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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