NET INCOME (LOSS) PER COMMON SHARE - Components of Computation of Basic and Diluted Net Income (loss) per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator for basic net income (loss) per common share [Abstract]
Net (loss) income	$ (129,573)	$ (35,338)	$ 50,072
Preferred stock dividends	(19,368)	(19,368)	(19,368)
Earnings participation of unvested equity awards	(137)	(100)	(102)
Numerator for basic net income (loss) per common share	$ (149,078)	$ (54,806)	$ 30,602
Denominator for basic net income (loss) per common share [Abstract]
Average number of shares of common stock outstanding (in shares)	96,242	89,349	91,565
Average unvested stock awards outstanding (in shares)	(750)	(627)	(451)
Denominator for basic net income (loss) per common share (in shares)	95,492	88,722	91,114
Basic net income (loss) per common share (in dollars per share)	$ (1.56)	$ (0.62)	$ 0.34
Numerator for diluted net income (loss) per common share [Abstract]
Numerator for basic net income (loss) per common share	$ (149,078)	$ (54,806)	$ 30,602
Denominator for basic net income (loss) per common share (in shares)	95,492	88,722	91,114
Net effect of dilutive equity awards (in shares)			116
Denominator for diluted net income (loss) per common share (in shares)	95,492	88,722	91,230
Diluted net income (loss) per common share (in dollars per share)	$ (1.56)	$ (0.62)	$ 0.34