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Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Financial information of joint ventures |  |  |
Current assets | $ 146,068 | $ 217,430 |
Current liabilities | 253,328 | 584,774 |
Voyage revenues (note 12b) | 379,975 | 374,008 | 343,048
Income from vessel operations | 173,503 | 178,960 | 152,940
Realized and unrealized (loss) gain on derivative instruments | (63,030) | (78,720) | (40,950)
Net income | 97,356 | 92,944 | 81,937
Equity Method Investments [Member] |  |  |
Financial information of joint ventures |  |  |
Current assets | 128,608 | 97,605 |
Non-current assets | 2,121,408 | 1,424,450 |
Current liabilities | 140,899 | 88,990 |
Non-current liabilities | 1,798,946 | 1,162,556 |
Voyage revenues (note 12b) | 167,094 | 106,371 | 99,593
Income from vessel operations | 124,553 | 83,992 | 80,951
Realized and unrealized (loss) gain on derivative instruments | (41,622) | (35,173) | 10,692
Net income | $ 51,492 | $ 20,092 | $ 59,918

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- Definition Voyage revenues currently include revenues only from time- charters accounted for under operating and direct financing leases. Voyage revenues are affected by hire rates and the number of calendar-ship-days a vessel operates. Voyage revenues are also affected by the mix of business between time and voyage charters. Hire rates for voyage charters are more volatile, as they are typically tied to prevailing market rates at the time of a voyage. + References No definition available. + Details
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