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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets    
Vessels, accumulated depreciation $ 464,518 $ 334,502
Deferred drydock, accumulated amortization 11,111 9,044
Other assets, accumulated amortization 7,749 4,561
Fixed assets, accumulated depreciation and amortization $ 2,422 $ 2,041
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 36,307,598 35,951,198
Common stock, shares outstanding (in shares) 36,307,598 35,951,198