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Basis of presentation and Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of Drydocking activity      
Balance at January 1 $ 2,019,576    
Cost incurred for drydocking (19,638) (12,727) (9,729)
Balance at December 31 2,021,125 2,019,576  
Drydocking Activity [Member]
     
Summary of Drydocking activity      
Balance at January 1 24,393 20,477 15,257
Cost incurred for drydocking 19,638 12,727 9,729
Sale of vessel   (1,477)  
Dry-dock amortization (9,582) (7,334) (4,509)
Balance at December 31 $ 34,449 $ 24,393 $ 20,477