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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator for basic net income (loss) per common share [Abstract]
Net income (loss)	$ 15,529	$ 22,704	$ 34,471	$ (181,949)
Preferred stock dividends	(4,842)	(4,842)	(9,684)	(9,684)
Earnings participation of unvested equity awards	(24)	(40)	(60)	(64)
Numerator for basic net income (loss) per common share	$ 10,663	$ 17,822	$ 24,727	$ (191,697)
Denominator for basic net income (loss) per common share [Abstract]
Average number of shares of common stock outstanding (in shares)	96,848	96,395	96,821	96,015
Average unvested stock awards outstanding (in shares)	(853)	(740)	(876)	(739)
Denominator for basic net income (loss) per common share (in shares)	95,995	95,655	95,945	95,276
Basic net income (loss) per common share (in dollars per share)	$ 0.11	$ 0.19	$ 0.26	$ (2.01)
Numerator for diluted net income (loss) per common share [Abstract]
Numerator for basic net income (loss) per common share	$ 10,663	$ 17,822	$ 24,727	$ (191,697)
Denominator for diluted net income (loss) per common share [Abstract]
Denominator for basic net income (loss) per common share (in shares)	95,995	95,655	95,945	95,276
Net effect of dilutive equity awards (in shares)	459	232	397
Denominator for diluted net income (loss) per common share (in shares)	96,454	95,887	96,342	95,276
Diluted net income (loss) per common share (in dollars per share)	$ 0.11	$ 0.19	$ 0.26	$ (2.01)