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COMMITMENTS AND CONTINGENCIES (DETAILS 4) (USD $)
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Dec. 31, 2011
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Common Shares [Member]
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| Dividends Payable [Line Items] | |
| Dividend payable per share | $ 0.24 |
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Series A 7.25% Preferred Shares [Member]
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| Dividends Payable [Line Items] | |
| Dividend payable per share | $ 0.453125 |
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Series B 7.5% Preferred Shares [Member]
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| Dividends Payable [Line Items] | |
| Dividend payable per share | $ 1.875 |