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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accrued Liabilities    
Voyage and vessel expenses $ 209,058 $ 179,553
Interest including interest rate swaps 63,310 70,760
Payroll and benefits and other 83,528 84,912
Deferred revenue 38,690 41,894
Accrued Liabilities $ 394,586 $ 377,119