SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Schedule of Activity in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, at beginning of year	$ 2,138	$ 2,378	$ 2,921
Net charges to expenses	217	711	476
Write-offs, net of recoveries	(1,791)	(951)	(1,019)
Balance, at end of year	$ 564	$ 2,138	$ 2,378