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ACCOUNTING POLICIES (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2010 segments | Dec. 31, 2012 segments | Dec. 31, 2011 | Dec. 31, 2010
Accounting Policies [Abstract] |  |  |  |
Revenue from loss of hire insurance |  | $ 2,100,000 | $ 400,000 | $ 300,000
Accumulated Other Comprehensive Loss: |  |  |  |
Unrealized net loss on qualifying cash flow hedging instruments |  | (6,832,000) | (19,462,000) |
Unrealized gain on available-for-sale securities |  | 5,911,000 | 0 |
Losses associated with pensions, net of tax recoveries of $0.3 million (2011: $0.4 million) |  | (17,809,000) | (15,486,000) |
Accumulated other comprehensive loss |  | (18,730,000) | (34,948,000) |
Tax recoveries from losses associated with pesnions |  | 300,000 | 400,000 |
Number of reportable segments | 1 | 2 |  |
Other operating gains and losses | Energy trading contract |  |  |  |
Trading activity: |  |  |  |
Gains and losses on trading activity |  | $ 0 | $ 2,000,000 | $ (5,300,000)

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