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	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic net income (loss) per common share [Abstract]
Net income (loss)	$ 3,196	$ 8,680	$ (68,010)	$ 41,088
Preferred stock dividends	(4,842)	(4,842)	(14,526)	(14,526)
Earnings participation of unvested equity awards	(25)	(24)	(69)	(84)
Numerator for basic net income (loss) per common share	$ (1,671)	$ 3,814	$ (82,605)	$ 26,478
Denominator for basic net income (loss) per common share [Abstract]
Average number of shares of common stock outstanding (in shares)	91,560	91,659	87,578	92,649
Average unvested stock awards outstanding (in shares)	(615)	(453)	(632)	(447)
Denominator for basic net income (loss) per common share (in shares)	90,945	91,206	86,946	92,202
Basic net income (loss) per common share (in dollars per share)	$ (0.02)	$ 0.04	$ (0.95)	$ 0.29
Numerator for diluted net income (loss) per common share [Abstract]
Numerator for basic net income (loss) per common share	$ (1,671)	$ 3,814	$ (82,605)	$ 26,478
Denominator for diluted net income (loss) per common share [Abstract]
Denominator for basic net income (loss) per common share (in shares)	90,945	91,206	86,946	92,202
Net effect of dilutive equity awards (in shares)		140		115
Denominator for diluted net income (loss) per common share (in shares)	90,945	91,346	86,946	92,317
Diluted net income (loss) per common share (in dollars per share)	$ (0.02)	$ 0.04	$ (0.95)	$ 0.29