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PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OTHER RECEIVABLES, PREPAID EXPENSES AND ACCRUED INCOME [Abstract]      
Prepaid expenses $ 2,982 $ 3,580  
Other receivables 4,348 17,697  
Corporation tax receivable 0 3,476  
Other receivables, prepaid expenses and accrued income 7,330 24,753  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impairment of Loan Receivable 7,627 $ 15,010 $ 0
DCLAP claim      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net $ 6,400