NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at Beginning of Period	$ 2,181	$ 1,800	$ 2,203
Charged to Costs and Expenses	1,704	1,325	619
Deductions/ Other	(2,156)	(944)	(1,022)
Balance at End of Year	$ 1,729	$ 2,181	$ 1,800