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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current    
Non trade accounts receivable $ 10,011 $ 12,832
Vessels and equipment    
Accumulated depreciation on vessel and equipment 291,689 200,676
Accumulated amortization on vessels under capital leases 163,926 169,274
Current    
Accounts payable owing to related parties 556 567
Accrued liabilities owing to related related parties $ 3,550 $ 3,020