ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Salaries and employee benefits	$ 10,289	$ 10,670
Sales, use and property tax (See Note 14)	3,367	2,376
Convention and meeting costs	4,970	5,129
Other	6,354	6,225
Total	$ 24,980	$ 24,400