SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 757	$ 643	$ 1,182	$ 1,444
Bad debt (recovery) expense	886	(23)	(143)
Reduction in allowance for doubtful accounts	$ (772)	$ (516)	$ (119)