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Stock-Based Compensation Plans (Details 1) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted	297,859	71,752	73,255
Weighted average market price	$ 38.44	$ 38.43	$ 43.68
Weighted average vesting period (years)	2.27	4.74	4.42

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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