Changes in Operations (Details 6) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2010	Sep. 30, 2010
Business Combination Pro Forma Information [Line Items]
Operating revenues	$ 182,070	$ 529,912
Net income	$ 27,315	$ 67,108
Basic earnings per common share from continuing operations	$ 0.63	$ 1.66
Diluted earnings per common share from continuing operations	$ 0.59	$ 1.55

Business Combination Pro Forma Information [Line Items]

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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