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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings (loss) per common share
Net income (loss)									$ 323,473	$ 43,021	$ (368,969)
Less: Preferred share dividends									41,112	42,625	46,810
Net income (loss) available (attributable) to common shareholders	$ (9,897)	$ 27,745	$ 166,387	$ 98,125	$ (198,448)	$ 43,439	$ 92,858	$ 62,546	$ 282,361	$ 396	$ (415,779)
Weighted average common shares outstanding (in shares)									83,894	83,501	84,108
Earnings (loss) per common share (in dollars per share)	$ (0.12)	$ 0.33	$ 1.98	$ 1.17	$ (2.37)	$ 0.52	$ 1.11	$ 0.75	$ 3.37	$ 0	$ (4.94)
Earnings (loss) per diluted common share
Net income (loss) available (attributable) to common shareholders	$ (9,897)	$ 27,745	$ 166,387	$ 98,125	$ (198,448)	$ 43,439	$ 92,858	$ 62,546	$ 282,361	$ 396	$ (415,779)
Weighted average common shares outstanding (in shares)									83,894	83,501	84,108
Share-based compensation plans (in shares)									579	506	0
Weighted average diluted common shares outstanding (in shares)									84,473	84,007	84,108
Earnings (loss) per diluted common share (in dollars per share)	$ (0.12)	$ 0.33	$ 1.97	$ 1.16	$ (2.37)	$ 0.52	$ 1.11	$ 0.75	$ 3.34	$ 0	$ (4.94)
Weighted average anti-dilutive shares excluded from the dilutive computation (in shares)									154	245	702

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