SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for doubtful accounts, Beginning balance			$ (2,674)
less allowance for doubtful accounts	$ (337)	$ (257)	(603)	$ (461)
Allowances for doubtful accounts	(1,645)	(1,199)	(3,127)	(2,116)
Bad debt expense			(3)
Total charges			(606)
Allowance for doubtful accounts, Ending balance	(3,280)		(3,280)
Medicaid [Member]
less allowance for doubtful accounts	(16)	(9)	(24)	(12)
Allowances for doubtful accounts	(16)	(9)	(25)	(12)
Medicare [Member]
less allowance for doubtful accounts	(97)	(68)	(175)	(127)
Allowances for doubtful accounts	(643)	(450)	(1,168)	(844)
Third Party Payer [Member]
less allowance for doubtful accounts	(224)	(180)	(404)	(322)
Allowances for doubtful accounts	$ (847)	$ (451)	$ (1,363)	$ (807)