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Unaudited Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Unaudited Consolidated Balance Sheets [Abstract]    
Non trade accounts receivable $ 10,091 $ 10,011
Accumulated depreciation on vessel and equipment 321,417 291,689
Accumulated amortization on vessels under capital leases 178,934 163,926
Accounts payable owing to related parties    556
Accrued liabilities owing to related related parties    $ 3,550