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Revenues from continuing operations (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepayments and other assets $ 2,736 $ 2,017
Deferred revenue, current 3,826 7,315
Bunker expenses    
Prepayments and other assets $ 0 397
Undelivered performance obligations    
Deferred revenue, current   $ 371