Summary of Significant Policies (Details 7) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Common Stock stock options excluded as anti-dilutive from determination of diluted earnings per share
Weighted average anti-dilutive stock options	216	270	226	40
Weighted average exercise price	$ 36.39	$ 36.38	$ 36.22	$ 54.36

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