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Long-Term Debt (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  |  |  | 1 Months Ended |  | 12 Months Ended
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Jan. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Aug. 31, 2011 | Jun. 30, 2011 | May 31, 2011 | Dec. 31, 2011 Helix Term Loan [Member] | Dec. 31, 2010 Helix Term Loan [Member] | Jul. 31, 2006 Helix Term Loan [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] | Dec. 31, 2010 Revolving Credit Facility [Member] | Dec. 31, 2011 Helix Revolving Loans [Member] | Jun. 30, 2009 Helix Revolving Loans [Member] | Jul. 31, 2006 Helix Revolving Loans [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] | Dec. 21, 2007 Senior Unsecured Notes [Member] | Dec. 31, 2005 Convertible Senior Notes [Member] | Mar. 31, 2005 Convertible Senior Notes [Member] | Dec. 31, 2011 Convertible Senior Notes [Member] | Dec. 31, 2010 Convertible Senior Notes [Member] | Sep. 30, 2005 MARAD Debt [Member] | Dec. 31, 2011 MARAD Debt [Member] | Dec. 31, 2010 MARAD Debt [Member] | Dec. 31, 2011 Letters Of Credit [Member] | Dec. 31, 2011 Other [Member] | Dec. 31, 2010 Other [Member] | Dec. 31, 2011 Senior Credit Facility [Member] | Dec. 31, 2011 Maximum [Member] | Feb. 28, 2010 Maximum [Member] Helix Term Loan [Member] | Dec. 31, 2011 Maximum [Member] Helix Revolving Loans [Member] | Dec. 31, 2011 Minimum [Member] | Dec. 31, 2011 Minimum [Member] Helix Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,400,000 | $ 41,400,000 |  |  |  |  |  |  |
Long-term debt, noncurrent |  | 1,147,444,000 | 1,347,753,000 |  |  |  |  | 276,750,000 |  |  |  |  |  |  |  | 474,960,000 |  |  |  |  |  |  | 290,445,000 | [1] |  |  |  | 105,289,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, carrying value |  | 1,164,876,000 | 1,376,460,000 |  |  |  |  |  |  |  |  |  |  |  |  | 474,960,000 | [2] | 550,000,000 | [2] |  |  | 300,000,000 | 300,000,000 | [2],[3] | 300,000,000 | [2],[3] |  | 110,166,000 | [4] | 114,811,000 | [4] |  |  |  |  |  |  |  |  |
Debt instrument purchase price percentage of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  | 1000.00% |  | 1000.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 835,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  | 3.25% |  |  |  | 4.93% |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion percentage threshold of the convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of notes percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated maturity year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | January 15, 2016 |  |  |  |  |  | 2025 |  |  |  |  | February 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of debt payment |  | 77,394,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment on senior unsecured notes |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest paid on notes |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of Senior Unsecured Notes |  | 2,354,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original borrowing capacity |  |  |  |  |  | 600,000,000 | 435,000,000 |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents plus available capacity under Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  | 2.00 to 1.00 |  |  |  |  |  |  |  |  | 4.50 to 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00 to 1.00 |  |  |  |  |
Margin increase |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  | 2.00%
Average interest rate |  |  |  |  |  |  |  | 3.80% | 2.90% |  |  |  |  | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate terms |  |  |  |  |  |  |  | one-, three- or six-month LIBOR at our current election plus a 2.00% margin (as amended in February 2010, the margin was increased up to 2.50% depending on current leverage ratios, as defined). |  |  | one-, three- or six-month LIBOR rates or on Base Rates at our current election plus an applicable margin as discussed below. Margins on the Revolving Loans will fluctuate in relation to the consolidated leverage ratio as provided in the Credit Agreement. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument proceeds from sale of oil and gas properties percentage |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument proceeds reinvested into collateral percentage |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility available |  | 600,000,000 |  |  |  |  |  |  |  |  | 558,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  | 109,400,000 |  | 349,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries permitted by credit agreement, excluding loan party subsidiaries and subsidiaries with pledged equity interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  | 100,000,000 |
Repurchases and redemptions permitted under credit agreement, common stock, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
Interest rate swap | 200,000,000 |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap maximum term in years | two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes, shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.56 |  | 31.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share conversion price |  | $ 38.56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64.27 |  | $ 32.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes are convertible into shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,303,770 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt percentage guaranteed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  | 9,300,000 | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  | 8,910,000 | 7,703,000 | 6,693,000 |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  | $ 26,483,000 | $ 25,697,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,500,000 | $ 25,700,000 |  |  |  |  |  |
[1] | Beginning in December 2012, we may at our option repurchase the notes or the holders may require us to repurchase the notes. The notes will increase to the $300 million face amount through accretion of non-cash interest charges through December 2012.
[2] | The fair values of these instruments were based on quoted market prices as of December 31, 2011 and 2010. The fair values were estimated using level 1 inputs using the market approach.
[3] | Carrying amounts exclude the $9.6 million and $18.5 million of unamortized discount on the Convertible Senior Notes at December 31, 2011 and 2010, respectively.
[4] | The fair value of the MARAD debt was determined by a third-party evaluation of the remaining average life and outstanding principal balance of the MARAD indebtedness as compared to other government guaranteed obligations in the market place with similar terms. The fair value of the MARAD debt was estimated using Level 2 fair value inputs using the market approach.

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