v2.4.0.6

Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Commodity Hedges [Member] |  |  |
Financial Instruments (Textual) [Abstract] |  |  |
Aggregated fair values of outstanding hedges, current assets | $ 1.4 | $ 1.9 |
Aggregated fair values of outstanding hedges, current liabilities | 0.7 | 6.5 |
Effective portions of changes in fair values recorded in stockholders equity as components of accumulated other comprehensive income | 0.4 | (2.6) |
Purchased put option [Member] |  |  |
Financial Instruments (Textual) [Abstract] |  |  |
Notional Amount (in Gallons per Month) | 25,000 |  |
Written call option [Member] |  |  |
Financial Instruments (Textual) [Abstract] |  |  |
Notional Amount (in Gallons per Month) | 25,000 |  |
Fuel hedges [Member] |  |  |
Financial Instruments (Textual) [Abstract] |  |  |
Aggregated fair values of outstanding hedges, current assets | 1.6 | 1.6 |
Aggregated fair values of outstanding hedges, current liabilities | 4.7 | 1.9 |
Effective portions of changes in fair values recorded in stockholders equity as components of accumulated other comprehensive income | 1.8 | 0.2 |
Realized (losses) gains fuel hedges included in cost of operations in consolidated statements of income | $ 0.9 | $ (2.0) | $ (7.3)
Costless collar agreements [Member] |  |  |
Financial Instruments (Textual) [Abstract] |  |  |
Forecasted maximum sales of costless collar agreement | 25,000 |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition Fair value current assets measured on recurring basis derivative financial instruments current assets. + References No definition available. + Details
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- Definition Fair Value Current Liabilities Measured On Recurring Basis Derivative Financial Instruments Current Liabilities + References No definition available. + Details
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- Details
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- Definition Forecasted sales of costless collar agreement + References No definition available. + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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
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- Definition The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -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
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