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Equity Investments (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 entity | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |
Number of equity investments | 2 |
Equity investments in unconsolidated affiliates | $ 152,588,000 | $ 157,919,000
Deepwater Gateway, L.L.C. [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 50.00% |
Equity investments in unconsolidated affiliates | 82,400,000 | 85,800,000
Capitalized interest | 1,200,000 | 1,300,000
Independence Hub, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 20.00% |
Equity investments in unconsolidated affiliates | 70,200,000 | 72,100,000
Capitalized interest | $ 4,000,000 | $ 4,300,000
Water depth | 8,000 |

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