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Ownership Of Cal Dive International, Inc. (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 10, 2009 | Jan. 31, 2009 | Mar. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2010 Cal Dive International Inc [Member] | Dec. 31, 2008 IPO [Member] | Jun. 30, 2009 Secondary Public Offering [Member] | Sep. 23, 2009 Second Secondary Public Offering [Member] | Sep. 24, 2009 Second Secondary Public Offering [Member]
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of subsidiary/equity method investee shares by parent company |  | 13.6 |  |  |  |  |  |  |  | 22.6 | 20.6 | 2.6
Gain on sale of Cal Dive common stock |  | $ (2,900,000) |  |  | $ 753,000 |  | $ 77,343,000 |  |  |  |  |
Ownership percentage in Cal Dive |  | 51.00% |  |  |  |  |  |  | 57.20% | 26.00% |  |
Proceeds from sale of Cal Dive common stock |  | 86,000,000 | 3,600,000 |  | 3,588,000 |  | 418,168,000 |  |  | 182,900,000 |  | 221,500,000
Repurchase of shares by subsidiary |  |  |  |  |  |  |  |  |  | 1.6 |  |
Proceeds from repurchase of common stock |  |  |  |  |  |  |  |  |  | 14,000,000 |  |
Common stock, per share |  |  |  |  |  |  |  |  |  | $ 8.50 |  | $ 10
Gain associated with the re-measurement of remaining ownership | 27,100,000 |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest | 26.00% |  |  |  |  |  |  |  |  |  |  |
Other than temporary impairment non-cash |  |  |  | 2,200,000 | 10,563,000 | 2,240,000 |  |  |  |  |  |
Remaining shares of Cal Dive common stock, shares |  |  |  |  |  | 0.5 |  |  |  |  |  |
Outstanding shares, percentage |  |  |  |  |  | 1.00% |  |  |  |  |  |
Gain (loss) on investment in Cal Dive common stock | 59,400,000 |  |  |  | 753,000 |  | 77,343,000 |  |  |  |  | 17,900,000
Equity investments |  |  |  | $ 187,031,000 | $ 175,656,000 | $ 187,031,000 |  | $ 2,800,000 |  |  |  |

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