EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings (loss) per common share
Net income (loss)	$ 618,609	$ (120,424)	$ 323,473
Less: Preferred share dividends	30,250	30,250	41,112
Net income (loss) available (attributable) to common shareholders	$ 588,359	$ (150,674)	$ 282,361
Weighted average common shares outstanding (in shares)	84,707	84,262	83,894
Earnings (loss) per common share (in dollars per share)	$ 6.95	$ (1.79)	$ 3.37
Earnings (loss) per diluted common share
Net income (loss) available (attributable) to common shareholders	$ 588,359	$ (150,674)	$ 282,361
Weighted average common shares outstanding (in shares)	84,707	84,262	83,894
Share-based compensation plans (in shares)	584	0	579
Weighted average diluted common shares outstanding (in shares)	85,291	84,262	84,473
Earnings (loss) per diluted common share (in dollars per share)	$ 6.90	$ (1.79)	$ 3.34
Weighted average anti-dilutive shares excluded from the dilutive computation (in shares)	656	922	154