NET INCOME (LOSS) PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic net income (loss) per share:
Net income (loss) applicable to common stockholders	$ 3,887	$ 25,460	$ (102,906)	$ 71,200
Weighted average common shares outstanding (in shares)	52,912	54,413	52,980	54,975
Basic net income (loss) per share (in usd per share)	$ 0.07	$ 0.47	$ (1.94)	$ 1.30
Diluted net income (loss) per share:
Net income (loss) applicable to common stockholders	$ 3,887	$ 25,460	$ (102,906)	$ 71,200
Weighted average common shares outstanding (in shares)	52,912	54,413	52,980	54,975
Dilutive stock options and restricted stock (in shares)	468	606	0	527
Diluted weighted average common shares outstanding (in shares)	53,380	55,019	52,980	55,502
Diluted net income (loss) income per share (in usd per share)	$ 0.07	$ 0.46	$ (1.94)	$ 1.28