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Equity Investments - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2004 USD ($) | Dec. 31, 2017 USD ($) ft | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Loss from equity method investments |  |  |  | $ 2,368,000 | $ 2,166,000 | $ 124,345,000
Investee losses in excess of investment |  |  |  | 7,567,000 | 10,238,000 |
Distributions from equity investments |  |  |  | 0 | 1,200,000 | 7,000,000
Sale of ownership interest for cash |  |  |  | $ 0 | 25,000,000 | 0
Summarized financial information, revenue |  |  |  |  |  | 14,800,000
Summarized financial information, operating loss |  |  |  |  |  | (448,100,000)
Summarized financial information, net loss |  |  |  |  |  | $ (448,100,000)
Independence Hub, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Percentage of ownership interest |  | 20.00% |  | 20.00% |  | 20.00%
Water depth (in feet) | ft |  |  |  | 8,000 |  |
Impairment charge |  | $ 343,300,000 |  |  |  |
Estimated fair value |  | 0 |  |  |  | $ 0
Loss from equity method investments |  |  |  | $ 2,400,000 | 2,200,000 | 74,900,000
Capitalized interest |  | $ 3,600,000 |  |  |  | 3,600,000
Participation fee |  |  | $ 1,000,000 |  |  |
Investee losses in excess of investment |  |  |  | $ 9,800,000 | $ 10,200,000 |
Distributions from equity investments |  |  |  |  |  | $ 1,800,000
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
Loss from equity method investments |  |  |  |  |  | 49,400,000
Capitalized interest |  | $ 1,200,000 |  |  |  | 1,200,000
Distributions from equity investments | $ 1,200,000 |  |  |  |  | $ 5,200,000
Sale of ownership interest for cash | $ 25,000,000 |  |  |  |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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