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DEBT - Schedule of Tranches (Details) - Line of Credit - Secured Debt - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Jul. 31, 2013
$449 million newbuild facility    
Debt Instrument [Line Items]    
Amount   $ 449.0
Proportion of facility   40.00%
Term of loan from date of drawdown 12 years  
Repayment terms Six-monthly installments  
$450 million newbuild facility    
Debt Instrument [Line Items]    
Amount   $ 450.0
Proportion of facility   40.00%
Term of loan from date of drawdown 12 years  
Repayment terms Six-monthly installments  
$226 million newbuild facility    
Debt Instrument [Line Items]    
Amount   $ 226.0
Proportion of facility   20.00%
Term of loan from date of drawdown 5 years  
Repayment terms Six-monthly installments, unpaid balance to be refinanced after 5 years