VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Provisions for doubtful accounts, service credits and other		$ 1,029	$ 763
Allowance for Doubtful Accounts, Service Credits and Other
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Provisions for doubtful accounts, service credits and other	$ 2,125
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	1,065	1,056	1,286
Additions		1,035	761
Write-offs	(1,485)	(1,026)	(991)
Balance at the End of the Period	$ 1,705	$ 1,065	$ 1,056