EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings (loss) per common share
Net income (loss)	$ 235,473	$ 120,040	$ 358,770	$ (57,783)
Less: Preferred share dividends	7,563	7,563	15,125	15,125
Net income (loss) available (attributable) to common shareholders	$ 227,910	$ 112,477	$ 343,645	$ (72,908)
Weighted average common shares outstanding (in shares)	84,764	84,303	84,640	84,198
Earnings (loss) per common share (in usd per share)	$ 2.69	$ 1.33	$ 4.06	$ (0.87)
Earnings (loss) per diluted common share
Net income (loss) available (attributable) to common shareholders	$ 227,910	$ 112,477	$ 343,645	$ (72,908)
Weighted average common shares outstanding (in shares)	84,764	84,303	84,640	84,198
Share-based compensation plans (in shares)	503	297	477	0
Weighted average diluted common shares outstanding (in shares)	85,267	84,600	85,117	84,198
Earnings (loss) per diluted common share (in usd per share)	$ 2.67	$ 1.33	$ 4.04	$ (0.87)
Weighted average anti-dilutive shares excluded from the dilutive computation (in shares)	445	1,391	1,071	1,098