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Long-Term Debt (Narrative) (Details) (USD $) | 1 Months Ended | 6 Months Ended |  |  |  |  | 6 Months Ended |  |  |  |  | 1 Months Ended |  | 1 Months Ended | 6 Months Ended |  |
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Jan. 31, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | May 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2010 | Jun. 30, 2011 Maximum [Member] Helix Term Loan [Member] | Jun. 30, 2011 Maximum [Member] Helix Revolving Loans [Member] | Jun. 30, 2011 Minimum [Member] Helix Term Loan [Member] | Jun. 30, 2011 Minimum [Member] Helix Revolving Loans [Member] | Jun. 30, 2011 Helix Term Loan [Member] | Jun. 30, 2010 Helix Term Loan [Member] | Jul. 31, 2006 Helix Term Loan [Member] | Jun. 30, 2011 Helix Revolving Loans [Member] | Jul. 31, 2006 Helix Revolving Loans [Member] | Dec. 31, 2007 Senior Unsecured Notes [Member] | Jun. 30, 2011 Senior Unsecured Notes [Member] | Mar. 31, 2005 Convertible Senior Notes [Member] | Jun. 30, 2011 Convertible Senior Notes [Member] | Jun. 30, 2011 MARAD Debt [Member] | Jun. 30, 2011 Letters of Credit [Member] | Jun. 30, 2011 Helix [Member] | Dec. 31, 2010 Helix [Member]
Unsecured letters of credit |  | $ 48,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,800,000 |  |
Long-term debt, noncurrent |  | 1,239,893,000 |  |  |  | 1,347,753,000 |  |  |  |  |  | 296,250,000 |  |  | 0 |  | 550,000,000 | 550,000,000 |  | 285,886,000 | [1] | 107,757,000 |  |  | 1,132,136,000 | 1,237,587,000
Long-term debt, Carrying Value |  | 1,261,766,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 550,000,000 | 300,000,000 | 300,000,000 | [2] | 112,516,000 | [3] |  |  |
Long Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 835,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  | 4.93% |  |  |  |
Stated maturity Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2016 |  |  | March 2025 |  | February 2027 |  |  |  |
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 |  |  |  |  |  |
Margin range |  |  |  |  |  |  |  | 3.50% | 3.50% | 3.25% | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate range |  |  |  |  |  |  |  | 2.50% | 2.50% | 2.25% | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.20% | 2.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility available |  | 551,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing under revolving credit facility |  | 109,400,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in Subsidiaries Permitted by Credit Agreement, Excluding Loan Party Subsidiaries and Subsidiaries With Pledged Equity Interests |  | 200,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.60% |  |  |  |  |  |
Per share conversion price |  |  |  |  | $ 32.14 |  | $ 32.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes are convertible into shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,303,770 |  |  |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | semi-annual |  |  |  |
Debt collateral percentage |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Finance Costs, Net |  | 30,127,000 |  |  |  | 25,697,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  | 4,777,000 | 3,768,000 |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of revolving credit facility |  | $ (109,400,000) | $ 0 |  |  |  |  |  |  |  |  | $ 109,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Beginning in December 2012, the holders may require us to repurchase the notes or we may at our own option elect to repurchase the notes. The notes will mature in March 2025.
[2] | Amount excludes the $14.1 million of unamortized discount recorded on the Convertible Senior Notes at June 30, 2011.
[3] | The estimated fair value of all debt, other than MARAD Debt, was determined using level 1 inputs using the market approach. The fair value of the MARAD debt was determined using a third party evaluation of the remaining average life and outstanding principal balance of the MARAD indebtedness as compared to other governmental 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 cost approach.

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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 + Details
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Period Type: | duration

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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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Balance Type: | debit
Period Type: | instant