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Vessels - Vessel costs, depreciation, impairment and amortization, and carrying amount (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
Property, Plant and Equipment  
As of beginning of period $ 1,665,810
As of end of period 1,611,115
Total Cost [Member]  
Property, Plant and Equipment  
As of January 1 2,071,456
Additions (1,157) [1]
Transferred from vessels upgrades 30,991
Retirement (3,116)
As of September 30 2,098,174
Total Accumulated Depreciation and Impairment [Member]  
Property, Plant and Equipment  
As of beginning of period 405,646 [2]
Depreciation and amortization 84,529 [2]
Impairment charges 0 [2]
Retirement (3,116) [2]
As of end of period $ 487,060 [2]
[1] Adjustments to capitalized expenses in 2018
[2] Accumulated numbers