v3.3.1.900
ALLOWANCE FOR DOUBTFUL ACCOUNTS
 12 Months Ended
Dec. 31, 2015
Accounts Receivable Additional Disclosures [Abstract]  
Allowance for Doubtful Accounts [Text Block]
ALLOWANCE FOR DOUBTFUL ACCOUNTS
The changes in the allowance for doubtful accounts consisted of the following:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(Thousands of Dollars)
Balance as of beginning of year
$
7,808

 
$
1,224

 
$
808

Increase in allowance, net
965

 
7,649

 
1,039

Accounts charged against the allowance
(300
)
 
(1,065
)
 
(625
)
Foreign currency translation
—

 
—

 
2

Balance as of end of year
$
8,473

 
$
7,808

 
$
1,224