Joint Development Agreement with CO2 Solutions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	0 Months Ended	12 Months Ended
Dec. 31, 2012	Dec. 15, 2009 CO2 Solutions [Member]	Dec. 31, 2013 CO2 Solutions [Member]
Joint Development Agreement with CO2 solutions (Textual) [Abstract]
Number of shares acquired in joint venture (shares)		10,000,000
Percentage of common shares outstanding at the time of investment (percent)		16.60%
Statutory resale restriction, expiry period (months)		4 months
Statutory resale restriction, expiry date		Apr. 15, 2010
Expiration period of original joint development agreement			2011-01
Other than Temporary Impairment Losses, Investments	$ 753

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-2/124-2

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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.

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