Minority Investments (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended
Oct. 30, 2011	Apr. 30, 2011	Jun. 29, 2011 Ignis ASA [Member]
Cost and Equity Method Investments [Abstract]
Cost method investment	$ 12,289	$ 12,289
Cost Method Investment, Number of Companies	3	3
Equity method investment	$ 0	$ 31,142
Cumulative percentage ownership after all transactions			100.00%

This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Name Emerging Issues Task Force (EITF)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details