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Acquisitions and Divestitures - Pro Forma (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Pro forma:
Revenues	$ 335,394	$ 1,041,350
Net income	$ 47,186	$ 140,670
Net income per common share:
Basic	$ 0.98	$ 2.94
Diluted	$ 0.98	$ 2.92

- Definition

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+ Details

- Definition

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.

+ References+ Details