v3.3.1.900
ACCRUED LIABILITIES (Tables)
12 Months Ended
Dec. 31, 2015
Accrued Liabilities, Current [Abstract]  
Schedule of Accrued Liabilities [Table Text Block]
Accrued liabilities consisted of the following:
 
December 31,
 
2015
 
2014
 
(Thousands of Dollars)
Derivative liabilities
$
121

 
$
4,623

Employee wages and benefit costs
31,143

 
32,349

Unearned income
14,290

 
10,884

Other
9,640

 
13,169

Accrued liabilities
$
55,194

 
$
61,025