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Commitments And Contingencies And Other Matters - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Commitments And Contingencies [Line Items] |  |
Total investment | $ 2,727,760 | $ 2,695,772
Q7000 |  |
Commitments And Contingencies [Line Items] |  |
Total investment | $ 323,500 |
Q7000 | Contract Signing |  |
Commitments And Contingencies [Line Items] |  |
Percentage of contract price | 20.00% |
Q7000 | Due 2016 |  |
Commitments And Contingencies [Line Items] |  |
Percentage of contract price | 20.00% |
Q7000 | Due December 2017 |  |
Commitments And Contingencies [Line Items] |  |
Percentage of contract price | 20.00% |
Q7000 | Due December 31, 2018 |  |
Commitments And Contingencies [Line Items] |  |
Percentage of contract price | 20.00% |
Q7000 | Vessel Delivery |  |
Commitments And Contingencies [Line Items] |  |
Percentage of contract price | 20.00% |
Q7000 | Shipyard |  |
Commitments And Contingencies [Line Items] |  |
Total investment | $ 207,600 |

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