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Equity Investments (Distributions From Equity Investments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments | $ 16,230 | $ 26,180 | $ 30,008
Deepwater Gateway, L.L.C. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments | 8,157 | 7,600 | 8,125
Independence Hub, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments | 8,073 | 18,580 | 21,615
Other [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments |  |  | $ 268

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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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