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ACCOUNTING POLICIES, CRITICAL ACCOUNTING ESTIMATES AND JUDGEMENTS (Details Textual 2)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Segment
Dec. 31, 2015
USD ($)
Segment
Jan. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Disclosure Of Accounting Policy [Line Items]          
Cash and cash equivalents $ 134,207 $ 168,258   $ 75,971 $ 38,056
Net debt 620,000        
Undrawn debt $ 271,000 75,000   190,000  
Net interest-bearing debt loan-to-value ratio 55.80%        
Raised equity $ 791,050 $ 975,976   $ 780,578 $ 469,514
Number of business segments | Segment   2      
Number of geographical segment | Segment 1        
Demurrage revenue claim percentage 95.00%        
Average period of receiving demurrage payment 100 days        
Major ordinary share transactions          
Disclosure Of Accounting Policy [Line Items]          
Raised equity     $ 100,000