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Vessels (Tables)
 9 Months Ended
Sep. 30, 2020
Vessels [Abstract]  
Vessel Costs
Cost of Vessels
   
$ in thousands
   
At January 1, 2020
  
2,106,997
 
Transferred from vessels upgrades
  
6,196
 
At September 30, 2020
  
2,113,192
 
     
Depreciation, impairment and amortization*
    
$ in thousands
    
At January 1, 2020
  
517,553
 
Depreciation and amortization
  
91,616
 
Impairment charges
  
4,920
 
At September 30, 2020
  
614,089
 
     
Carrying Amount
    
$ in thousands
    
At January 1, 2020
  
1,589,444
 
At September 30, 2020
  
1,499,103
 

*Accumulated numbers

Cost of vessel upgrades
   
$ in thousands
   
At January 1, 2020
  
11,652
 
Additions
  
15,850
 
Transferred to vessels
  
(6,196
)
At September 30, 2020
  
21,306
 
     
Carrying Amount
    
$ in thousands
    
At January 1, 2020
  
11,652
 
At September 30, 2020
  
21,306