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Vessel Operating Expenses (Tables)
 12 Months Ended
Dec. 31, 2016
Operating Expense  
Vessel Operating Expenses
          
  Year Ended
December 31,
  2014 2015 2016
Crew wages and related costs  $26,169 $29,338 $29,581
Insurance   4,133  3,932  3,452
Repairs, maintenance and drydocking costs   4,344  6,178  2,752
Spares, stores and provisions   9,058  8,362  7,015
Lubricants   3,509  4,116  3,754
Taxes   1,282  1,392  1,347
Miscellaneous   2,139  2,151  1,618
Total  $50,634 $55,469 $49,519