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Commitments and Contingencies (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 NOK (kr)
Loss Contingencies [Line Items] |  |  |
Coverage for pollution |  | $ 1,000,000 |
Arbitration proceedings | Star Polaris |  |  |
Loss Contingencies [Line Items] |  |  |
Name of defendant |  | Hanjin HHIC-Phil Inc |
Off hire days | 142 |  |
Loss on revenues due to off hire | $ 2,343 |  |
Vessel upgrades (3) |  |  |
Loss Contingencies [Line Items] |  |  |
Secured financing related to commitments payments |  | $ 134,225 |
Vessel upgrades (3) | Loan and Bareboat Lease Agreements |  |  |
Loss Contingencies [Line Items] |  |  |
Secured financing related to commitments payments |  | 92,400 |
Vessel upgrades (3) | Loan and Finance Lease Agreements |  |  |
Loss Contingencies [Line Items] |  |  |
Secured financing related to commitments payments |  | $ 41,825 |
Bareboat commitments charter hire (4) |  |  |
Loss Contingencies [Line Items] |  |  |
Capital leased assets, Number of vessels |  | 3 | 3
Variable portion of payment to SWS owner |  | 3-month LIBOR rate of 2.808% |
Office rent (5) |  |  |
Loss Contingencies [Line Items] |  |  |
Office rent |  | $ 1,647 |
Office rent (5) | Indefinite rental agreement |  |  |
Loss Contingencies [Line Items] |  |  |
Office rent |  | $ 22 |
Exchange rate NOK/USD |  | 0.1156 | 0.1156
Office rent (5) | Indefinite rental agreement | NOK |  |  |
Loss Contingencies [Line Items] |  |  |
Office rent | kr |  |  | kr 188,000
Payments fo E.R. Vessel acquisition (6) | Indefinite rental agreement |  |  |
Loss Contingencies [Line Items] |  |  |
Number of vessels acquired |  | 2 | 2

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