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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Non trade accounts receivable $ 11,654 $ 10,011
Accumulated depreciation on vessel and equipment 351,092 291,689
Accumulated depreciation vessels under capital leases 133,228 163,926
Accounts payable owing to related parties    556
Accrued liabilities owing to related parties   $ 3,550