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Vessels (Tables)
12 Months Ended
Dec. 31, 2012
Vessels (Abstract)  
Vessels (Table Text Block)
 
Net Book Value
Carrying amount as at January 1, 2011
$
707,339
Acquisitions and improvements
 
403,861
Depreciation
 
(37,214)
Carrying amount as at December 31, 2011
$
1,073,986
Acquisition and improvements
 
133,105
Disposals
 
(156,128)
Impairment of vessels
 
(43,178)
Depreciation
 
(48,235)
Carrying amount as at December 31, 2012
$
959,550