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Derivative Instruments and Hedging Activities (Details Textual) | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |
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Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2011 EUR (€) | Dec. 31, 2009 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2011 Norwegian Kroner-denominated Bonds due November 2013 [Member] NOK | Dec. 31, 2010 Cross currency swap agreement [Member] USD ($) | Dec. 31, 2011 Cross currency swap agreement [Member] USD ($) | Dec. 31, 2011 Cross currency swap agreement [Member] EUR (€) | Dec. 31, 2011 Bunker fuel swap contracts [Member] Contract | Dec. 31, 2010 Bunker fuel swap contracts [Member] Contract | Dec. 31, 2011 Foreign currency forward contracts [Member] USD ($)
Derivative Instrument and Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of NOK |  |  |  |  |  | 600,000,000 |  | $ 98,500,000 |  |  |  |
Floating interest rate above NIBOR |  |  |  |  |  |  |  | 4.75% | 4.75% |  |  |
Floating interest rate above LIBOR |  |  |  |  |  |  |  | 5.04% | 5.04% |  |  |
Principal amount of Euro-denominated interest rate swaps |  |  |  |  |  |  |  |  | 269,200,000 |  |  |
Number of Bunker Fuel Swap Contract Commitments |  |  |  |  |  |  |  |  |  | 0 | 0 |
Fair value of cross currency swap agreement |  |  |  |  |  |  |  | 2,700,000 |  |  |  |
Unrealized gains (losses) of the cross currency swap | (1,600,000) |  |  |  |  |  | 4,000,000 |  |  |  |  |
Realized gains (losses) of the cross currency swap | 2,900,000 | 200,000 |  |  |  |  |  |  |  |  |  |
Unrealized gains on foreign currency forward contracts designated cash flow hedges | (306,000) | 2,295,000 |  | 2,923,000 | (58,723,000) |  |  |  |  |  |  | 300,000
Derivative Instrument and Hedging Activities (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Minimum variable interest rate on debt | 0.30% |  |  |  |  |  |  |  |  |  |  |
Maximum variable interest rate on debt | 3.25% |  |  |  |  |  |  |  |  |  |  |
Reduced Principal amount of Euro-denominated interest rate swaps | 90,900,000 |  | 70,100,000 |  |  |  |  |  |  |  |  |
Net loss on foreign currency forward contract | (400,000) |  |  |  |  |  |  |  |  |  |  |
Estimated time to reclassify, net loss from Income to other Comprehensive income | 12 Months |  |  |  |  |  |  |  |  |  |  |
Net losses reclassified from accumulated other comprehensive loss to earnings | $ 0 | $ 600,000 |  |  |  |  |  |  |  |  |  |

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