FAIR VALUE (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amounts included in:
Restricted cash	$ 8,800	$ 9,100
Recurring Basis
Assets
Money Market Funds – JPMorgan Chase, US	8,000	0
Interest bearing deposits – various banks	9,277	23,695
Amounts included in:
Cash and cash equivalents	10,504	16,651
Restricted cash	740	741
Long-term restricted cash	6,033	6,303
Total	17,277	23,695
Recurring Basis | Level 1
Assets
Money Market Funds – JPMorgan Chase, US	8,000	0
Interest bearing deposits – various banks	9,277	23,695
Amounts included in:
Cash and cash equivalents	10,504	16,651
Restricted cash	740	741
Long-term restricted cash	6,033	6,303
Total	17,277	23,695
Recurring Basis | Level 2
Assets
Money Market Funds – JPMorgan Chase, US	0	0
Interest bearing deposits – various banks	0	0
Amounts included in:
Cash and cash equivalents	0	0
Restricted cash	0	0
Long-term restricted cash	0	0
Total	0	0
Recurring Basis | Level 3
Assets
Money Market Funds – JPMorgan Chase, US	0	0
Interest bearing deposits – various banks	0	0
Amounts included in:
Cash and cash equivalents	0	0
Restricted cash	0	0
Long-term restricted cash	0	0
Total	$ 0	$ 0