v3.5.0.2
Asset Impairments and Sales of Vessels - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Vessel
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Vessel
Sep. 30, 2015
USD ($)
Property, Plant and Equipment [Line Items]          
Write-downs   $ 7,800   $ 14,200  
Number of medium range tankers impaired | Vessel   2   2  
Number of medium range tankers held for sale | Vessel   1   1  
Gain (loss) on sale   $ (137) $ 0 $ (137) $ 0
MR Tanker [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Property, Plant and Equipment [Line Items]          
Sale price $ 14,000        
Gain (loss) on sale $ (100)