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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2012
Accounts Receivable [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
ACCOUNTS RECEIVABLE
December 31,
 
2012
 
2011
(Thousands of dollars)
 
 
 
 
Trade receivables
 
$
91,747

 
$
114,811

Other receivables
 
7,293

 
5,423

 
 
99,040

 
120,234

Allowance for doubtful accounts
 
(573
)
 
(339
)
Accounts receivable, net
 
$
98,467

 
$
119,895