FAIR VALUE (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	$ 9,100	$ 7,900
Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds – Fidelity, US	0	12
Interest bearing deposits – various banks	23,695	19,357
Cash and cash equivalents	16,651	13,326
Restricted cash	741	737
Long-term restricted cash	6,303	5,306
Total	23,695	19,369
Recurring Basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds – Fidelity, US	0	12
Interest bearing deposits – various banks	23,695	19,357
Cash and cash equivalents	16,651	13,326
Restricted cash	741	737
Long-term restricted cash	6,303	5,306
Total	23,695	19,369
Recurring Basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds – Fidelity, US	0	0
Interest bearing deposits – various banks	0	0
Cash and cash equivalents	0	0
Restricted cash	0	0
Long-term restricted cash	0	0
Total	0	0
Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds – Fidelity, US	0	0
Interest bearing deposits – various banks	0	0
Cash and cash equivalents	0	0
Restricted cash	0	0
Long-term restricted cash	0	0
Total	$ 0	$ 0