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Commitments And Contingencies And Other Matters - Narrative (Details) $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2014 vessel | Sep. 30, 2013 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Total investment |  |  | $ 2,562,835 | $ 2,450,890
Q7000 [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Contract amount |  | $ 346,000 |  |
Total investment |  |  | 207,100 |
Payment of shipyard costs |  |  | $ 138,400 |
Q7000 [Member] | Contract Signing [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Percentage of contract price paid or to be paid |  |  | 20.00% |
Q7000 [Member] | Due 2016 [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Percentage of contract price paid or to be paid |  |  | 20.00% |
Q7000 [Member] | Issuance of Completion Certificate [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Percentage of contract price paid or to be paid |  |  | 20.00% |
Q7000 [Member] | Vessel Delivery [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Percentage of contract price paid or to be paid |  |  | 40.00% |
Monohull Vessels [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Number of chartered vessels | vessel | 2 |  |  |
Topside Equipment [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Total investment |  |  | $ 275,000 |
Siem [Member] | Monohull Vessels [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Term of charter agreement | 7 years |  |  |
Petrobras [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Term of contract | 4 years |  |  |

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