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Stock-Based Compensation (Details 1) (USD $)	6 Months Ended
Stock-Based Compensation (Details 1) (USD $)	Jun. 30, 2012
Stock appreciation rights [Member]
Summary of stock-based compensation grants
Stock Awards Granted	94,797
Weighted-Average Grant Price Per Share	$ 25.56
Restricted stock [Member]
Summary of stock-based compensation grants
Stock Awards Granted	66,210
Weighted-Average Grant Price Per Share	$ 25.56

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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