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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets    
Vessels, accumulated depreciation $ 597,214 $ 464,518
Deferred drydock, accumulated amortization 8,086 11,111
Other assets, accumulated amortization 13,162 7,749
Fixed assets, accumulated depreciation and amortization $ 3,311 $ 2,422
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) 44,270,273 36,307,598
Common stock, shares outstanding (in shares) 44,270,273 36,307,598