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Accrued Liabilities
 12 Months Ended
Dec. 31, 2016
Notes To Consolidated Financial Statements  
Accrued Liabilities

14. Accrued Liabilities

Accrued liabilities are comprised of the following:

   December 31,
   2015 2016
 Interest on long-term debt  $1,627 $2,193
 Vessels’ operating and voyage expenses   1,784  1,568
 Commissions   76  139
 Interest on derivatives and other finance expenses   398  162
 General and administrative expenses   99  91
 Total  $3,984 $4,153