RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax (benefit)	$ 363	$ 2,523	$ 150
Income tax benefit recognized as an operating activity	0	(619)	0
Income tax expense recognized as a financing activity	0	(619)	0
Non-current deferred income tax liabilities	7,069	9,513
Cash classified to restricted cash	3,532	0
ASU 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax (benefit)	(100)		0
Income tax benefit recognized as an operating activity	100
Income tax expense recognized as a financing activity	600	200	$ 800
ASU 2015-17 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-current deferred income tax liabilities		$ 9,513
ASU 2016-18 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash classified to restricted cash	$ 3,500