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Summary of Significant Accounting Policies (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in Equity Method Investment | 50.00% |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Maturity period of short-term investments | P13W |  |
Impairments of goodwill | $ 0 | $ 0 | $ 0
Insurance coverage of general liability and auto liability risks | 100,000,000 |  |
Insurance policy covering pollution liability | 30,000,000 |  |
Tax benefit recognized | Greater than 50% |  |
Asset retirement obligations | 75,000 |  |
Assets held for sale | $ 0 | $ 0 |
Minimum [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in Equity Method Investment | 20.00% |  |
Maximum [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in Equity Method Investment | 50.00% |  |

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- Definition Insurance coverage of general liability and auto liability risks. + References No definition available. + Details
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- Definition Insurance policy covering pollution liability. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 46 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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