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Equity Investments - Distributions From Equity Investment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity method investments | $ 1,200 | $ 7,000 | $ 8,790
Deepwater Gateway, L.L.C. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity method investments | 1,200 | 5,200 | 6,150
Independence Hub, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity method investments | $ 0 | $ 1,800 | $ 2,640

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- Definition Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities. + References No definition available. + Details
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