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Equity Investments (Details) (USD $) | 12 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Deepwater Gateway, L.L.C. [Member] | Dec. 31, 2011 Deepwater Gateway, L.L.C. [Member] | Dec. 31, 2012 Independence Hub, LLC [Member] | Dec. 31, 2011 Independence Hub, LLC [Member] | Dec. 31, 2011 Clough Helix JV [Member] | Jun. 30, 2012 Clough Helix JV [Member] | Mar. 31, 2012 Clough Helix JV [Member] | Dec. 31, 2011 Clough Helix JV [Member] | Dec. 31, 2010 Clough Helix JV [Member]
Equity method investment, ownership percentage |  |  |  | 50.00% |  | 20.00% |  | 50.00% | 50.00% |  | 50.00% |
Equity investments in unconsolidated affiliates | $ 167,599,000 | $ 175,656,000 |  | $ 91,400,000 | $ 96,000,000 | $ 76,200,000 | $ 79,700,000 |  |  |  |  |
Capitalized interest |  |  |  | 1,300,000 | 1,400,000 | 4,600,000 | 4,900,000 |  |  |  |  |
Equity in earnings of investments | 8,434,000 | 22,215,000 | 19,469,000 |  |  |  |  |  | 3,700,000 | (3,800,000) | 2,100,000 | (3,600,000)
Exit Fee |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Other than temporary loss on equity investments |  | $ 10,563,000 | $ 2,240,000 |  |  |  |  | $ 10,600,000 |  |  |  |

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