SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES (Customer and Credit Risk Concentration) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) customers	Dec. 31, 2018 USD ($) customers	Dec. 31, 2017 USD ($) customers
Concentration Risk [Line Items]
Revenues | $	$ 114,457	$ 114,159	$ 102,865	$ 89,188	$ 93,307	$ 110,085	$ 109,482	$ 103,081	$ 420,669	$ 415,955	$ 431,755
Distributors [Member]
Concentration Risk [Line Items]
Revenues | $									$ 304,600	$ 313,900	$ 330,900
Credit Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage benchmark for total accounts receivable	10.00%				10.00%				10.00%	10.00%
Number of major customers | customers									10	10
Concentration Risk, Percentage									63.00%	64.00%
Credit Concentration Risk | Accounts Receivable | Powertech Distribution Ltd.
Concentration Risk [Line Items]
Concentration Risk, Percentage										17.00%
Credit Concentration Risk | Accounts Receivable | Powertech Distribution Ltd.
Concentration Risk [Line Items]
Concentration Risk, Percentage									10.00%	11.00%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk [Line Items]
Number of major customers | customers									10	10	10
Concentration Risk, Percentage									10.00%	10.00%	10.00%
Concentration risk percentage of net revenue									54.00%	56.00%	54.00%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark [Member] | Powertech Distribution Ltd.
Concentration Risk [Line Items]
Concentration risk percentage of net revenue									11.00%	14.00%	16.00%