Acquisitions and Divestitures (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Allocation of Purchase Price for business acquisition transactions
Current assets	$ 26,017	$ 46,842
Property and equipment	280,639	169,209
Goodwill	73,923	10,537
Intangible assets	2,260	1,730
Other long-term assets	3,497
Liabilities	28,089	51,124
Summary of business acquisition operation
Pro forma net operating revenues	12,180,247	11,792,639
Pro forma net income	$ 173,697	$ 259,978
Pro forma net income per share:
Basic	$ 1.93	$ 2.83
Diluted	$ 1.92	$ 2.80

Business acquisition purchase price allocation intangible assets.

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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.

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

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The amount of acquisition cost of a business combination allocated to current assets.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to liabilities assumed.

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The amount of acquisition cost of a business combination allocated to noncurrent assets of the acquired entity, except for property plant and equipment, intangible assets, and goodwill.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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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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