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Incentive Plans (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options/SOSARs
Cash and stock consideration received from exercises	$ 3,596	$ 20,502	$ 22,719
Tax benefit from exercises	66	733	1,965
Compensation cost	$ 7,968	$ 11,288	$ 15,195

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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