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Derivative Instruments and Hedging Activities (Details) | Dec. 31, 2011 USD ($) | Dec. 31, 2011 Norwegian Kroner [Member] USD ($) | Dec. 31, 2011 Norwegian Kroner [Member] NOK | Dec. 31, 2011 Euro [Member] USD ($) | Dec. 31, 2011 Euro [Member] EUR (€) | Dec. 31, 2011 Canadian Dollar [Member] USD ($) | Dec. 31, 2011 Canadian Dollar [Member] CAD | Dec. 31, 2011 British Pounds [Member] USD ($) | Dec. 31, 2011 British Pounds [Member] GBP (£)
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Commitment of foreign currency forward contracts |  |  |  |  |  |  |  |  |
Contract Amount in Foreign Currency |  |  | 1,044,500,000 |  | € 34,600,000 |  | 36,800,000 |  | £ 34,500,000
Average Forward Rate |  |  | 6.00 |  | 0.74 |  | 1.01 |  | 0.64
Fair Value / Carrying Amount of Asset / (Liability) of Hedge Derivatives | 100,000 | 600,000 |  |  |  | (200,000) |  | (300,000) |
Fair Value / Carrying Amount of Asset / (Liability) of Non-Hedge Derivatives | (4,500,000) | (1,600,000) |  | (1,700,000) |  | (300,000) |  | (900,000) |
Expected Maturity Amount of Foreign Currency Derivatives in Current Year | 260,500,000 | 141,300,000 |  | 40,900,000 |  | 31,800,000 |  | 46,500,000 |
Expected Maturity Amount of Foreign Currency Derivatives in Next Fiscal Year | $ 51,000,000 | $ 32,800,000 |  | $ 5,800,000 |  | $ 4,600,000 |  | $ 7,800,000 |

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- Definition Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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