Acquisition (Details Textual) (Corporacion de Occidente [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2011	Jan. 14, 2011	Dec. 31, 2010
Corporacion de Occidente [Member]
Acquisition (Textual) [Abstract]
Ownership acquired		20.00%
Additional amount invested		$ 21,775
Equity investments ownership percentage	58.00%	38.00%
Net reduction in goodwill due to valuation	2,536
Percentage of Assets and liabilities to be consolidated		100.00%
Investment in unconsolidated subsidiary			24,398
Cumulative currency loss			4,893
Gain in original investment	4,989
Fair value of carrying value original investment		$ 34,280

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Additional amount invested.

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Gain loss on original investment in minority interest due to increased investment.

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Minority interest additional ownership percentage by parent.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Purchase price allocation adjustment for allocation not yet complete at the prior year end.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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