NET INCOME (LOSS) PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)				0
Basic net income (loss) per share:
Net income (loss) applicable to common stockholders	$ 11,008	$ 3,887	$ 26,477	$ (102,906)
Weighted average common shares outstanding (in shares)	49,974,000	52,912,000	51,116,000	52,980,000
Basic net income (loss) per share (in usd per share)	$ 0.22	$ 0.07	$ 0.52	$ (1.94)
Diluted net income (loss) per share:
Net income (loss) applicable to common stockholders	$ 11,008	$ 3,887	$ 26,477	$ (102,906)
Weighted average common shares outstanding (in shares)	49,974,000	52,912,000	51,116,000	52,980,000
Dilutive stock options and restricted stock (in shares)	607,000	468,000	669,000	0
Diluted weighted average common shares outstanding (in shares)	50,581,000	53,380,000	51,785,000	52,980,000
Diluted net income (loss) income per share (in usd per share)	$ 0.22	$ 0.07	$ 0.51	$ (1.94)