Acquisition (Details Textual) (Corporacion de Occidente [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jan. 14, 2011	Dec. 31, 2010
Corporacion de Occidente [Member]
Acquisition (Textuals) [Abstract]
Ownership acquired		20.00%
Additional amount invested		$ 21,775
Equity investments ownership percentage	58.00%	38.00%
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

Acquisition.

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Additional amount invested.

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- Definition

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

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- Definition

Minority interest additional ownership percentage by parent.

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Percentage of minority interest assets liabilities consolidated by Parent.

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- Definition

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 (losses).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 12, 13

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-Subparagraph a

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 26

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph f

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a (1)

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment losses recognized.

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Value of the investment at close of period. For schedules of investments that are categorized, the value should 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 14
-Paragraph 2, 3
-Article 12

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-Number 210
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph Column E
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 13
-Paragraph Column C
-Article 12

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