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Commitments And Contingencies And Other Matters - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 USD ($) renewal_option | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |
Total investment |  | $ 2,785,778 | $ 2,695,772 |
Total rental expense |  | 147,800 | 114,500 | $ 87,800
Total rental income |  | 1,400 | $ 1,300 | $ 1,600
Minimum rentals to be received in the future |  | 3,500 |  |
Scotland |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Term of lease agreement | 15 years |  |  |
Number of renewal options | renewal_option | 2 |  |  |
Term of renewal option | 5 years |  |  |
Annual minimum lease payment | $ 800 |  |  |
Q7000 |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Total investment |  | $ 403,800 |  |
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 2017 |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Percentage of contract price |  | 20.00% |  |
Q7000 | Due 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% |  |
Siem | Siem Helix 1 and Siem Helix 2 |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Term of charter agreement |  | 7 years |  |
Shipyard | Q7000 |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Total investment |  | $ 276,800 |  |

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