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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2004
Transfers between Level 1 and Level 2      
Asset transfers between Level 2 to Level 1 $ 0   $ 0
Asset transfers between Level 1 to Level 2 0   0
Liability transfers between Level 1 to Level 2 0   0
Liability transfers between Level 2 to Level 1 0   $ 0
Recurring basis      
Assets:      
Assets held for sale   $ 300  
Recurring basis | Interest rate swaps      
Assets:      
Derivative   66  
Liabilities:      
Derivative 2,930 1,957  
Recurring basis | Level 2      
Assets:      
Assets held for sale   300  
Recurring basis | Level 2 | Interest rate swaps      
Assets:      
Derivative   66  
Liabilities:      
Derivative $ 2,930 $ 1,957