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Derivative Instruments and Hedging Activities (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Derivatives designated as a cash flow hedge:    
Current Portion of Derivative Assets $ 24,712 $ 27,215
Derivatives not designated as a cash flow hedge:    
Derivative Assets 140,557 55,983
Accrued Liabilities (24,525) (30,975)
Current Portion of Derivative Liabilities (117,337) (144,111)
Derivative Liabilities (569,542) (387,124)
Foreign currency contracts [Member] | Derivatives designated as a cash flow hedge [Member]
    
Derivatives designated as a cash flow hedge:    
Current Portion of Derivative Assets 1,551 3,437
Derivatives not designated as a cash flow hedge:    
Derivative Assets 28 1,546
Current Portion of Derivative Liabilities (1,192) (652)
Derivative Liabilities (264) 22
Foreign currency contracts [Member] | Derivatives not designated as a cash flow hedge [Member]
    
Derivatives designated as a cash flow hedge:    
Current Portion of Derivative Assets 2,592 4,988
Derivatives not designated as a cash flow hedge:    
Derivative Assets 3 3,172
Current Portion of Derivative Liabilities (6,248) (1,050)
Derivative Liabilities (832) (88)
Interest Rate Swap Agreements [Member] | Derivatives not designated as a cash flow hedge [Member]
    
Derivatives designated as a cash flow hedge:    
Current Portion of Derivative Assets 15,608 16,759
Derivatives not designated as a cash flow hedge:    
Derivative Assets 139,651 45,524
Accrued Liabilities (24,750) (31,174)
Current Portion of Derivative Liabilities (109,897) (135,171)
Derivative Liabilities (568,446) (387,058)
Cross currency swap [Member] | Derivatives not designated as a cash flow hedge [Member]
    
Derivatives designated as a cash flow hedge:    
Current Portion of Derivative Assets 1,576  
Derivatives not designated as a cash flow hedge:    
Derivative Assets 875  
Accrued Liabilities 225  
Foinaven embedded derivative [Member] | Derivatives not designated as a cash flow hedge [Member]
    
Derivatives designated as a cash flow hedge:    
Current Portion of Embedded Derivative Assets 3,385  
Derivatives not designated as a cash flow hedge:    
Embedded Derivative Assets   3,738
Embedded Derivative Liabilities   (7,238)
Forward freight agreements [Member] | Derivatives not designated as a cash flow hedge [Member]
    
Derivatives designated as a cash flow hedge:    
Current Portion of Derivative Assets   2,031
Derivatives not designated as a cash flow hedge:    
Derivative Assets   2,003
Accrued Liabilities   $ 199