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Related Party Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Related Party Transaction, Date	Nov. 14, 2008
Percentage Of The Right To Be Received By Related Party From The Net Profit	20.00%
Current equity investment	$ 6,600
Future equity quarterly investments	400
Related Party Transaction, Amounts of Transaction	152	123
Revenue from Related Parties	$ 143	$ 119
Common Class B [Member]
Related Party Transaction [Line Items]
Number Of Shares Issued By The Subsidiary For The Related Party Transaction	20

Amount of transactions with related party during the financial reporting period.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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