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Basis of Consolidation Policy Additional Information (Details)
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3 Months Ended |
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Mar. 31, 2013
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Maximum [Member]
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| Ownership Interest to be Held for Consolidation [Line Items] | |
| Ownership Interest To Use Equity Method | 50.00% |
| Ownership Interest To Use Cost Method | 20.00% |
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Minimum [Member]
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| Ownership Interest to be Held for Consolidation [Line Items] | |
| Ownership Interest to be Held for Consolidation | 50.00% |