FAIR VALUE (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and cash equivalents	$ 14,563	$ 21,064
Restricted cash	39,991	6,399
Prepaid expenses and other current assets	2,352	2,434
Noncurrent restricted cash		20,252
Financial Liabilities [Abstract]
Accrued expenses	11,771	12,815
Other short term liabilities	558	653
Credit facility	52,593
Term loan		44,267
Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	14,563	21,064
Restricted cash	39,991	6,399
Prepaid expenses and other current assets	2,352	2,434
Noncurrent restricted cash		20,252
Financial Liabilities [Abstract]
Accrued expenses	11,771	12,815
Other short term liabilities	558	653
Credit facility	47,200
Term loan		40,687
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	14,563	21,064
Restricted cash	39,991	6,399
Prepaid expenses and other current assets	0	0
Noncurrent restricted cash		20,252
Financial Liabilities [Abstract]
Accrued expenses	0	0
Other short term liabilities	0	0
Credit facility	0
Term loan		0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	0	0
Restricted cash	0	0
Prepaid expenses and other current assets	2,352	2,434
Noncurrent restricted cash		0
Financial Liabilities [Abstract]
Accrued expenses	11,771	12,815
Other short term liabilities	558	653
Credit facility	47,200
Term loan		40,687
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	0	0
Restricted cash	0	0
Prepaid expenses and other current assets	0	0
Noncurrent restricted cash		0
Financial Liabilities [Abstract]
Accrued expenses	0	0
Other short term liabilities	0	0
Credit facility	$ 0
Term loan		$ 0