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Vessels, net (Tables)
 6 Months Ended
Jun. 30, 2017
Property Plant And Equipment [Abstract]  
Vessels, net
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Vessel Cost
 
  
Accumulated
depreciation
 
  
Net book
value
Balance as at January 1, 2017
  
$
1,775,689
  
  
$
(407,958
) 
  
$
1,367,731
 
  
 
 
 
  
 
 
 
  
 
 
Improvements
  
 
944
 
  
 
—  
  
  
 
944
Depreciation for the period
  
 
—  
  
  
 
(35,689
 ) 
  
 
(35,689
)
 
  
 
 
 
  
 
 
 
  
 
 
Balance as at June 30, 2017
  
$
1,776,633
  
  
$
(443,647)
 
  
$
1,332,986