Capital Structure (Details) (Common Shares - Class A)	Jun. 30, 2013	Dec. 31, 2012
Common Shares - Class A
Class of Stock
Common stock - shares outstanding	11,321,442	11,001,403

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant