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Divestment of investments (Details Textual) In Thousands, unless otherwise specified	1 Months Ended		9 Months Ended			12 Months Ended
	Mar. 31, 2010 USD ($)	Mar. 31, 2010 GBP (£)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2011 GBP (£)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 GBP (£)	Dec. 31, 2009
Business Acquisition, Percentage of Voting Interests Acquired								49.00%
Proceeds from Sale of Equity Method Investments	$ 1,136	£ 750	$ 0	$ 401
Gain (Loss) on Sale of Equity Investments				81	51
Deferred Consideration Final Installment Amount						$ 370	£ 244

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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