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Contributed Capital | 12 Months Ended
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Dec. 31, 2012
Contributed Capital | 9. Contributed Capital Contributed capital includes the impact of share-based awards. See note 12 for further discussion. Also included in contributed capital is the grant date fair value of warrants issued in 2008 which expire on April 13, 2013.

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- Definition Contributed Capital Text Block. + References No definition available. + Details
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Namespace Prefix: | opy_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration