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Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2017
Payables and Accruals [Abstract]  
Schedule of accrued liabilities
Accrued liabilities consisted of the following (in thousands of dollars):
 
 
September 30,
2017
 
December 31,
2016
Accrued compensation expenses
$
4,966

 
$
6,120

Accrued other
3,092

 
2,990

Total accrued liabilities
$
8,058

 
$
9,110