EQUITY METHOD INVESTMENTS (Combined Assets and Liabilities of Equity Method Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 37,497	$ 37,680
Total assets	37,497	37,680
Current liabilities	28,910	29,335
Non-current liabilities	9,865	10,301
Equity/(deficiency)	(1,278)	(1,956)
Total liabilities and equity/(deficiency)	$ 37,497	$ 37,680