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Equity Investments - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 29, 2016 USD ($) | Mar. 31, 2016 USD ($) ft | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Sale of ownership interest for cash |  | $ 25,000 | $ 0 |
Loss in excess of carrying amount of equity investment |  | $ (8,430) |  | $ (8,308)
Deepwater Gateway, L.L.C. [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of ownership interest |  | 50.00% |  |
Sale of ownership interest for cash | $ 25,000 |  |  |
Independence Hub, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of ownership interest |  | 20.00% |  |
Water depth | ft |  | 8,000 |  |
Loss in excess of carrying amount of equity investment |  | $ (8,400) |  | $ (8,300)

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