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Vessels (Tables)
 9 Months Ended
Sep. 30, 2019
Vessels (Tables) [Abstract]  
Vessel Costs
Vessel Costs

Cost of Vessels
  
$ in thousands
  
At January 1, 2019
 2,071,456
Additions**
(1,157)
Transferred from vessels upgrades
30,991
Retirement
(3,116)
At September 30, 2019
2,098,174
   
Depreciation, impairment and amortization*
  
$ in thousands
  
At January 1, 2019
405,646
Depreciation and amortization
84,529
Impairment charges
-
Retirement
(3,116)
At September 30, 2019
487,060
   
Carrying Amount  
$ in thousands  
At January 1, 2019  1,665,810
At September 30, 2019 1,611,115
Vessel upgrades
Vessel upgrades

Cost of vessel upgrades
 
$ in thousands
 
At January 1, 2019
 -
Additions
 36,639
Transferred to vessels
 (30,991)
At September 30, 2019
 5,648
 
 
Carrying Amount
 
$ in thousands
 
At January 1, 2019
-
At September 30, 2019
5,648