XML 118 R99.htm IDEA: XBRL DOCUMENT v3.5.0.2
TRADE ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Trade accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Provision for doubtful accounts $ 0 $ 0