EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Numerator:
Net loss	$ (3,910)	$ (224)
Number of shares outstanding, end of period:
Unvested restricted stock (in shares)	(38)	(88)
Effect of weighted average shares outstanding (in shares)	(280)	(208)
Weighted average common shares outstanding (in shares)	42,370	41,584
Antidilutive potentially issuable shares (in shares)	2,105	2,683
Class A Common Stock
Number of shares outstanding, end of period:
Common stock, outstanding shares (in shares)	41,700	40,892	41,298
Class B Common Stock
Number of shares outstanding, end of period:
Common stock, outstanding shares (in shares)	988	988	988