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Equity Investments (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Deepwater Gateway [Member] | Dec. 31, 2010 Deepwater Gateway [Member] | Dec. 31, 2011 Independence Hub [Member] | Dec. 31, 2010 Independence Hub [Member] | Dec. 31, 2011 Clough Helix Pty Ltd. [Member] | Dec. 31, 2010 Clough Helix Pty Ltd. [Member] | Dec. 31, 2011 Sapura [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  | 20.00% |  |  |  | 50.00%
Construction costs |  |  |  |  | $ 120,000,000 |  |  |  |  |  |
Equity investments | 187,031,000 | 175,656,000 | 187,031,000 |  | 96,000,000 | 99,800,000 | 79,700,000 | 82,400,000 |  |  | 10,600,000
Capitalized interest |  |  |  |  | 1,400,000 | 1,500,000 | 4,900,000 | 5,200,000 |  |  |
Equity in earnings (loss) of investments |  | 22,215,000 | 19,469,000 | 32,329,000 |  |  |  |  | 2,100,000 | (3,600,000) |
Other than temporary impairment non-cash | $ 2,200,000 | $ 10,563,000 | $ 2,240,000 |  |  |  |  |  |  |  | $ 10,600,000

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