SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable percentage not attained by individual customer	10.00%
Allowance for doubtful accounts	$ 643	$ 1,182	$ 1,444	$ 1,517
Bad debt (recovery) expense	(23)	(143)	157
Reduction in provision for doubtful accounts	$ (516)	$ (119)	$ (230)