EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings (loss) per common share
Net income (loss)	$ (177,827)	$ 108,781
Less: Preferred share dividends	7,563	10,656
Net income (loss) available (attributable) to common shareholders	$ (185,390)	$ 98,125
Weighted average common shares outstanding (in shares)	84,094	83,725
Earnings (loss) per common share (in usd per share)	$ (2.20)	$ 1.17
Earnings (loss) per diluted common share
Net income (loss) available (attributable) to common shareholders	$ (185,390)	$ 98,125
Weighted average common shares outstanding (in shares)	84,094	83,725
Share-based compensation plans (in shares)	0	547
Weighted average diluted common shares outstanding (in shares)	84,094	84,272
Earnings (loss) per diluted common share (in usd per share)	$ (2.20)	$ 1.16
Weighted average anti-dilutive shares excluded from the dilutive computation (in shares)	806	601