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Equity Investments - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jul. 31, 2015 USD ($) | Dec. 31, 2004 USD ($) | Dec. 31, 2016 USD ($) ft | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Consideration transferred for business sold |  |  | $ 1,500,000,000 |  |  |  |
Investee losses in excess of investment |  | $ 8,308,000 |  |  | $ 10,238,000 | $ 8,308,000 |
Loss from equity method investments |  |  |  |  | 2,166,000 | 124,345,000 | $ (879,000)
Equity method investment |  | $ 26,200,000 |  |  | 0 | 26,200,000 |
Sale of ownership interest for cash |  |  |  |  | $ 25,000,000 | $ 0 | $ 0
Independence Hub, LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest |  | 20.00% |  |  |  | 20.00% |
Water depth (in feet) | ft |  |  |  |  | 8,000 |  |
Impairment charge |  | $ 343,300,000 |  |  |  |  |
Estimated fair value |  | 0 |  |  |  | $ 0 |
Asset retirement obligation |  | 42,100,000 |  |  | $ 52,500,000 | 42,100,000 |
Investee losses in excess of investment |  | 8,300,000 |  |  | 10,200,000 | 8,300,000 |
Loss from equity method investments |  |  |  |  | $ 2,200,000 | 74,900,000 |
Capitalized interest |  | $ 3,600,000 |  |  |  | $ 3,600,000 |
Participation fee |  |  |  | $ 1,000,000 |  |  |
Deepwater Gateway, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest |  | 50.00% |  |  |  | 50.00% |
Impairment charge |  | $ 96,700,000 |  |  |  |  |
Estimated fair value |  | 70,800,000 |  |  |  | $ 70,800,000 |
Asset retirement obligation |  | 20,800,000 |  |  |  | 20,800,000 |
Loss from equity method investments |  |  |  |  |  | 49,400,000 |
Capitalized interest |  | 1,200,000 |  |  |  | 1,200,000 |
Equity method investment |  | $ 26,200,000 |  |  |  | $ 26,200,000 |
Cash distribution | $ 1,200,000 |  |  |  |  |  |
Sale of ownership interest for cash | $ 25,000,000 |  |  |  |  |  |

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