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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts receivable, non-trade $ 109,114 $ 83,046
Accounts receivable, related party balance 16,371 9,101
Accumulated depreciation on vessels and equipment 2,135,780 1,976,257
Accumulated amortization on Vessels under capital leases 152,020 133,228
Range of interest 0.25% 0.31%
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 71,528,599 70,203,388
Common Stock, share outstanding 70,729,399 69,704,188
Minimum [Member]
    
Range of interest 0.00% 0.00%
Maximum [Member]
    
Range of interest 8.00% 8.00%