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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts receivable, non-trade $ 83,046 $ 38,120
Accounts receivable, related party balance 9,101 3,487
Accumulated depreciation on vessels and equipment 1,976,257 2,102,856
Accumulated amortization on Vessels under capital leases 133,228 163,939
Amounts due to joint venture partners $ 13,282 $ 13,282
Common stock, par value $ 0.001 $ 0.001
Common stock, share authorized 725,000,000 725,000,000
Common Stock, share issued 70,203,388 74,391,691
Common Stock, share outstanding 69,704,188 68,732,341
Minimum [Member]
   
Range of interest 4.40% 4.40%
Maximum [Member]
   
Range of interest 8.00% 8.00%