Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Details)

v3.8.0.1
DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Unrealized gain (loss) $ (1) $ 5 $ 1 $ (9)  
Realized loss 14 $ 30 53 $ 100  
Interest Rate Swaps [Member]          
Derivative [Line Items]          
Term loan in pay fixed, receive variable interest rate swap 10,000   10,000    
Term loan secured by plant, pipeline and equipment 14,000   14,000    
Notional amount $ 1,000   $ 1,000   $ 1,750
Derivative, variable interest rate 5.83%   5.83%    
Fair value of interest rate swap - liability $ 7   $ 7   $ 58