NET INCOME PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic net income per share:
Net income	$ 9,180	$ 32,756
Weighted average common shares outstanding - Basic (in shares)	85,188	85,343
Basic net income per common share (in dollars per share)	$ 0.11	$ 0.38
Diluted net income per share:
Net income	$ 9,180	$ 32,756
Weighted average common shares outstanding - Basic (in shares)	85,188	85,343
Effect of dilutive securities:
Stock options and restricted stock (in shares)	704	915
Weighted average common shares for diluted earnings per share (in shares)	85,892	86,258
Diluted net income per common share (in dollars per share)	$ 0.11	$ 0.38