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Long-Term Debt (Narrative) (Details) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Aug. 31, 2012 | Mar. 31, 2012 Convertible Senior Notes 2032 [Member] | Dec. 31, 2012 Convertible Senior Notes 2032 [Member] | Mar. 06, 2012 Convertible Senior Notes 2032 [Member] | Feb. 28, 2013 Helix Term Loan [Member] | Dec. 31, 2012 Helix Term Loan [Member] | Feb. 19, 2013 Helix Term Loan [Member] | Feb. 21, 2012 Helix Term Loan [Member] | Dec. 31, 2011 Helix Term Loan [Member] | Jul. 31, 2006 Helix Term Loan [Member] | Feb. 19, 2013 Revolving Credit Facility [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] | Mar. 31, 2012 Revolving Credit Facility [Member] | Jul. 31, 2006 Revolving Credit Facility [Member] | Feb. 28, 2013 Helix Revolving Loans [Member] | Dec. 31, 2012 Helix Revolving Loans [Member] | Mar. 31, 2012 Senior Unsecured Notes [Member] | Mar. 31, 2012 Senior Unsecured Notes [Member] | Sep. 30, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] | Dec. 31, 2007 Senior Unsecured Notes [Member] | Feb. 28, 2013 Convertible Senior Notes 2025 [Member] | Dec. 31, 2012 Convertible Senior Notes 2025 [Member] | Mar. 31, 2005 Convertible Senior Notes 2025 [Member] | Dec. 31, 2012 Convertible Senior Notes 2025 [Member] | Mar. 31, 2012 Convertible Senior Notes 2025 [Member] | Dec. 31, 2011 Convertible Senior Notes 2025 [Member] | Dec. 31, 2012 MARAD Debt [Member] | Dec. 31, 2011 MARAD Debt [Member] | Sep. 30, 2005 MARAD Debt [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] Helix Term Loan [Member] | Dec. 31, 2012 Minimum [Member] Helix Revolving Loans [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Helix Term Loan [Member] | Dec. 31, 2012 Maximum [Member] Helix Revolving Loans [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base Principal Amount |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory Prepayments Percentage |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Convertible Conversion Premium Percentage |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness Of Foreign Subsidiaries | 400,000,000 |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance Of Notes Percentage |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes, shares of common stock |  |  |  |  |  |  | 39.9752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes amount issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current maturities | 1,002,621,000 |  | 1,147,444,000 |  |  |  | 168,312,000 | [1] |  |  | 359,181,000 | [2] |  |  |  |  |  |  |  |  |  |  | 100,000,000 | [2] |  |  |  | 274,960,000 | 475,000,000 | 550,000,000 |  |  |  |  |  |  |  |  |  |  | 100,168,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, Carrying Value |  |  |  |  |  | 200,000,000 | 200,000,000 | [3] |  |  |  |  | 73,300,000 | 100,000,000 |  |  | 78,100,000 | 100,000,000 | [4] |  |  |  |  |  |  |  |  | 274,960,000 | 474,960,000 |  |  |  | 3,487,000 | [5] | 300,000,000 | 3,487,000 | [5] |  | 300,000,000 | [5] | 105,288,000 | [6] | 110,166,000 | [6] |  |  |  |  |  |  |
Percentage Of Principal To Be Paid Due To Change Of Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  | 4.93% |  |  |  |  |  |
Aggregate amount of debt payment | 209,500,000 |  | 77,394,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 213,500,000 | 77,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  | 75,000,000 |  |  |  |  |  |  |  |  | 145,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium on debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 | 2,400,000 |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest on notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 800,000 |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated amortization of debt discount | 9,729,000 |  | 8,973,000 | 8,409,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | 17,127,000 |  | 2,354,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,500,000 |  |  |  |  |  |  |  | 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents plus available capacity under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |
Spread on LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  | 2.25% | 1.50% |  | 3.50% | 3.50%
Revolving credit facility, outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 835,000,000 |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  |  |  |  |  |  | 3.70% |  |  |  | 3.80% |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 487,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan, annual amortization of principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share conversion price |  |  |  |  |  |  | $ 25.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.14 |  |  | $ 32.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs, net | 24,338,000 |  | 26,483,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs | 9,086,000 |  | 8,910,000 | 7,703,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 900,000 |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of revolving credit facility |  |  | 109,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  | 195,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt percentage guaranteed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price per share |  |  |  |  |  |  |  |  | $ 18.53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | 31,688,000 | [7] | 9,555,000 |  |  | 35,400,000 | 31,688,000 | [1],[7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Expected life used to estimate fair value | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  | 3.00% |  |
Deferred financing costs | 7,580,000 |  | 9,311,000 | 2,947,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 12,569,000 |  | $ 130,691,000 | $ 4,326,000 |  |  |  |  |  | $ 293,900,000 |  |  |  |  |  |  |  |  |  |  |  | $ 24,500,000 |  |  |  |  |  |  |  |  |  | $ 3,500,000 | $ 154,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Beginning in March 2018, the holders of these Convertible Senior Notes may require us to repurchase these notes or we may at our own option elect to repurchase notes. These notes will mature in March 2032.
[2] | Term Loan amounts reflect both our Term Loan A and Term Loan B. In February 2013, we repaid $293.9 million of our Term Loans and $24.5 million under our Revolving Credit Facility with the after-tax proceeds from the sale of ERT.
[3] | Carrying value excludes the related unamortized debt discount of $31.7 million at December 31, 2012.
[4] | In February 2013, we repaid $293.9 million of our Term Loans and $24.5 million under our Revolving Credit Facility with the after-tax proceeds from the sale of ERT.
[5] | Carrying value excludes the related unamortized debt discount of $9.6 million at December 31, 2011.
[6] | The estimated fair value of all debt, other than the 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 marketplace with similar terms. The fair value of the MARAD Debt was estimated using Level 2 fair value inputs using the market approach.
[7] | The notes will increase to their principal amount through accretion of non-cash interest charges through March 2018 for the Convertible Senior Notes due 2032.

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