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Stock Option Plans and Restricted Stock Grants (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010 Y	Dec. 31, 2009 Y
Estimated fair value of the stock options
Dividend Yield	3.80%	4.10%	4.00%
Risk-free interest rate	1.30%	1.60%	2.50%
Expected life	7.0	7.4	7.2
Weighted-average grant-date fair value of options granted	$ 3.07	$ 2.76	$ 2.88

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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