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Accounting Policies (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
vessel
Sep. 30, 2015
USD ($)
Quantifying Misstatement in Current Year Financial Statements [Line Items]    
Out of period correction   $ (1,578)
Number of vessels in sale and leaseback transaction | vessel 6  
Out of Period Correction | Asset Under Development    
Quantifying Misstatement in Current Year Financial Statements [Line Items]    
Out of period correction $ 13,200  
Out of Period Correction | Long-term Debt    
Quantifying Misstatement in Current Year Financial Statements [Line Items]    
Out of period correction 5,800  
Out of Period Correction | Interest Expense    
Quantifying Misstatement in Current Year Financial Statements [Line Items]    
Out of period correction (13,200)  
Out of Period Correction | Other Financial Items, Net    
Quantifying Misstatement in Current Year Financial Statements [Line Items]    
Out of period correction $ 5,800