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Long-Term Debt (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  | 12 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, 2012 Helix [Member] | Dec. 31, 2011 Helix [Member] | Dec. 31, 2012 Convertible Senior Notes 2032 [Member] | Mar. 31, 2012 Convertible Senior Notes 2032 [Member] | Dec. 31, 2012 Helix Term Loan [Member] | Dec. 31, 2011 Helix Term Loan [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] | Dec. 31, 2012 2025 Notes [Member] | Dec. 31, 2011 2025 Notes [Member] | Dec. 31, 2012 2032 Notes [Member] | Dec. 31, 2012 Helix Revolving Loans [Member] | Dec. 31, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2010 Senior Unsecured Notes [Member] | Dec. 31, 2011 Convertible Senior Notes 2025 [Member] | Dec. 31, 2012 MARAD Debt [Member] | Dec. 31, 2011 MARAD Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,019,228 |  | $ 1,155,321 |  |  |  |  |  | $ 367,181 |  | $ 279,750 | $ 100,000 | $ 3,487 | $ 300,000 | $ 200,000 |  |  | $ 274,960 | $ 474,960 |  |  | $ 105,288 | $ 110,166
Current maturities | (16,607) |  | (7,877) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current maturities | 1,002,621 |  | 1,147,444 | 902,453 | 1,042,155 | 168,312 | [1] |  | 359,181 | [2] |  |  |  |  |  | 100,000 | [2] | 274,960 | 475,000 | 550,000 |  | 100,168 |
Unamortized debt discount | $ (31,688) | [3] | $ (9,555) |  |  | $ (31,688) | [1],[3] | $ (35,400) |  |  |  |  |  |  |  |  |  |  |  |  | $ (9,600) |  |
Maturity date |  |  |  |  |  |  |  |  | July 2015 |  |  | July 2015 | December 2025 |  | March 2032 |  |  | January 2016 |  |  |  | February 2027 |
[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] | 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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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. + Details
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