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Other operational gain (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gain Contingencies [Line Items]      
Other operational gain $ 2,918 $ 1,565 $ 592
Gain (Loss) Related to Litigation Settlement $ 2,139    
Korea Line Corporation, Rehabilitation plan      
Gain Contingencies [Line Items]      
Proceeds from sale of trading securities     $ 550