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) | ||||